Two opposite strategies, one common question: what is the best way to structure our meals?

For years, eating five meals a day was widely recommended to keep the metabolism “active,” control hunger, and promote a healthy body weight. More recently, intermittent fasting has gained popularity as an effective strategy for losing body fat and improving certain metabolic markers. But what does the scientific evidence actually say? Do we need to eat every few hours, or can we safely go for long periods without food?

Adriana Martín – Neolife Nutrition Unit

The Origin of the Five-Meal Myth

The recommendation to eat five meals a day was largely based on the idea that eating frequently keeps the metabolism “active” and prevents excessive hunger before the main meals.

However, the energy expenditure associated with digestion—known as the thermic effect of food—depends primarily on the total amount of calories and nutrients consumed, not on how many meals those calories are divided into. In other words, consuming 2,000 kcal spread across three meals or five meals produces a very similar energy expenditure.

Furthermore, the most recent studies show that increasing meal frequency does not provide a significant advantage for body weight or body composition when total calorie intake remains the same.

What Exactly Is Intermittent Fasting?

Intermittent fasting is not about eating specific foods or following a special diet. Instead, it involves restricting food intake to a defined eating window.

One of the most commonly used approaches is the 16:8 protocol, which consists of fasting for 16 hours and consuming all meals within an 8-hour window—for example, eating the first meal at noon and finishing the last meal by 8:00 p.m.

Its popularity stems from the fact that many people find it easier to reduce their overall energy intake by limiting the amount of time available for eating rather than consciously counting calories.

What Does the Scientific Evidence Say?

Meta-analyses published in recent years reach an interesting conclusion: when calorie and protein intake are matched, intermittent fasting and conventional meal patterns produce very similar results for weight loss.

However, some studies suggest that certain forms of time-restricted eating may offer additional benefits for insulin sensitivity, blood glucose control, and several cardiometabolic health markers.

Even so, these benefits tend to be modest and depend largely on long-term adherence.

Overall, the evidence suggests that the quality of the diet, overall energy balance, and consistency of healthy habits matter far more than the number of meals consumed each day.

So, How Many Meals Should We Eat?

The short answer is that there is no single ideal number of meals that works for everyone.

Some people manage their hunger better by eating three main meals a day. Others prefer to include one or two additional meals or snacks. Likewise, some individuals feel comfortable practicing intermittent fasting, while others experience increased hunger, irritability, or find it difficult to maintain over time.

What truly matters is choosing an eating pattern that allows you to:

• Meet your nutritional requirements.
• Maintain an adequate protein intake.
• Promote long-term adherence.
• Fit your personal lifestyle and work schedule.

Which Strategy Works Best in Practice?

For most healthy individuals, eating three to four meals per day is generally sufficient to achieve adequate nutrition without making daily life unnecessarily complicated.

Intermittent fasting can be a useful tool for people who prefer to concentrate their food intake within a shorter period of the day, but it is neither a magic solution nor a requirement for improving health.

Likewise, eating five meals a day does not boost metabolism or guarantee greater weight loss.

Three Key Takeaways

• Your metabolism does not work faster simply because you eat five times a day.
• Intermittent fasting can be an effective strategy, but it is not superior to other approaches when calorie intake is the same.
• The best meal pattern is the one you can maintain consistently as part of a healthy lifestyle over the long term.

What You Can Do This Week

• Pay attention to the times of day when you feel hungriest and have the most energy.
• Try eating three or four meals a day for several days and assess how satisfied you feel.
• Focus on the quality of your food choices rather than the exact number of meals you eat.

Conclusion

The real question is not whether eating five meals a day is better than practicing intermittent fasting. Instead, the key is identifying the eating pattern that helps you nourish your body, manage your appetite, and maintain healthy habits in a sustainable way. Current scientific evidence indicates that both approaches can be effective, provided they are accompanied by a high-quality diet and tailored to each individual’s needs and preferences.

BIBLIOGRAPHY

(1) Moon S, Kang J, Kim SH, et al. Beneficial effects of intermittent fasting: a narrative review. Journal of Yeungnam Medical Science. 2020.

(2) Varady KA, Cienfuegos S, Ezpeleta M, et al. Clinical application of intermittent fasting for weight loss: progress and future directions. Nature Reviews Endocrinology. 2022.

(3) Schoenfeld BJ, Aragon AA. How much protein can the body use in a single meal? Implications for daily protein distribution. Journal of the International Society of Sports Nutrition. 2018.

(4) Bellisle F, McDevitt R, Prentice AM. Meal frequency and energy balance. British Journal of Nutrition. 1997.

La entrada Do You Need to Eat Five Meals a Day, or Is Intermittent Fasting Better? se publicó primero en Neolife.

GLP-1 medications are transforming weight loss. But there is one aspect that receives far less attention: how you eat during treatment can make all the difference.

Over the past few months, names such as Ozempic, Wegovy, and Mounjaro have moved from medical consultations into everyday conversations and social media feeds. Weight loss seems more accessible than ever, yet one important question often goes unaddressed: What happens to our nutrition when appetite decreases so dramatically?

Adriana Martín Peral – Neolife Nutrition Unit

The GLP-1 Revolution: What Is Happening?

A few years ago, the idea that medications could help people lose between 10% and 20% of their body weight might have sounded overly optimistic. Today, however, it is a reality.

Drugs such as semaglutide and tirzepatide have transformed the management of obesity and overweight. Their popularity has grown so rapidly that they have moved beyond endocrinology clinics into newspaper headlines, podcasts, and workplace conversations.

Amid all this discussion, however, one crucial point is often overlooked: Losing weight is not simply about losing pounds.

The real question is: What kind of weight are we losing?

How Do These Medications Actually Work?

Although many people describe them as “weight-loss injections,” their mechanism of action is far more interesting.

GLP-1 medications mimic gut hormones that help regulate appetite and blood glucose levels. In simple terms, they make people:

• Feel less hungry.
• Feel full sooner.
• Think less about food.
• Reduce caloric intake with little conscious effort.

And here lies an interesting paradox: Eating less does not necessarily mean eating better.

When appetite decreases significantly, it becomes easy to unknowingly adopt poorer eating habits—skipping meals, reducing protein intake, or avoiding essential foods simply because “nothing sounds appealing.”

The Underappreciated Risk: Losing Muscle Along with Fat

One of the most important—and least discussed—aspects of GLP-1 therapy is that not all weight loss comes from body fat.

Part of the weight lost may come from lean muscle mass, and this matters much more than many people realize.

Muscle is not only important for strength or body composition. It also plays a vital role in:

• Metabolism.
• Bone health.
• Future mobility.
• Healthy aging.
• Blood glucose regulation.

Losing fat can improve metabolic health, but excessive muscle loss may have the opposite effect in the medium and long term.

That is why the goal should not simply be to weigh less, but rather to improve body composition.

How Nutrition Changes When Taking GLP-1 Medications

This is where nutrition stops being secondary and becomes a central part of treatment.

1. Protein Is No Longer Optional

As appetite decreases, many people eat less of everything—including protein. Yet maintaining an adequate protein intake is essential to preserving muscle mass during weight loss.

In practice, this often means prioritizing:

• Fish.
• Eggs.
• Lean meats.
• High-protein dairy products.
• Legumes
• High-quality plant proteins.

Sometimes meals even need to be reorganized to ensure adequate protein intake, despite reduced hunger.

2. Strength Training Matters More Than Cardio

An increasingly common recommendation among specialists is this: If you are losing weight, you need to stimulate your muscles. Strength training—adapted to each individual’s abilities—helps send the body an important message: “This muscle tissue is still needed.”

There is no need to become an athlete or train six days a week. But it is important to understand that while walking is excellent for health, it may not be enough on its own.

3. Greater Satiety Does Not Mean Better Nutrition

Many people describe an experience like this: “I simply don’t feel like eating anymore.”
Although this may initially seem like an advantage, it can also lead to diets that are deficient in fiber, vitamins, and minerals. In other words: Less hunger does not automatically translate into better nutrition.

Food quality still matters.

So… Are They a Good Tool?

The short answer is: They can be, in the right context.

GLP-1 medications are producing very promising results and can significantly improve health when there is an appropriate medical indication. However, it is important to move beyond the simplistic notion that the medication “does everything.”

The reality is both more interesting and more useful: Treatment works best when combined with: A well-designed nutritional strategy. Strength training. Medical supervision. Sustainable lifestyle changes.
Because the goal is not simply to lose weight quickly. The goal is to improve health without sacrificing muscle mass, energy, or quality of life.

Conclusion

We are witnessing a major shift in the treatment of overweight and obesity. GLP-1 medications have opened possibilities that seemed unimaginable just a few years ago.

But perhaps the most important lesson is this: As appetite decreases, nutrition becomes even more important.

Eating less may be relatively easy. Eating better—while preserving muscle mass and metabolic health—still requires strategy. And that is where a well-designed nutritional approach truly makes the difference.

BIBLIOGRAPHY

(1) Wilding JPH, et al. Once-Weekly Semaglutide in Adults with Overweight or Obesity. New England Journal of Medicine. 2021.

(2) Jastreboff AM, et al. Tirzepatide Once Weekly for the Treatment of Obesity. New England Journal of Medicine. 2022.

(3) Wharton S, et al. Obesity in adults: a clinical practice guideline. CMAJ. 2020.

(4) Metaanálisis sobre cambios en composición corporal y pérdida de masa magra asociada a terapias GLP-1 en obesidad

La entrada The Weight-Loss Drug Boom (GLP-1): Why Nutrition Matters More Than Ever se publicó primero en Neolife.

Discover why taking care of your gut means taking care of your entire body — from your immune system to your mood.

For a long time, the gut was thought to be responsible only for digesting food. Today, we know its role goes far beyond that. Inside it lives a complex ecosystem of microorganisms — the gut microbiota — that directly influences key aspects of our health. Taking care of it not only improves digestion, but can also help you feel more energetic, less inflamed, and emotionally more balanced.

Adriana Martín Peral – Neolife Nutrition Unit

What Is the Microbiota and Why Does It Matter?

The gut microbiota is the collection of trillions of microorganisms — bacteria, viruses, fungi, and others — that live in your intestines. Although it may sound strange, these tiny inhabitants play a crucial role in your health.

Among the microbiota’s main functions are:

• Digesting food and producing nutrients such as B vitamins and vitamin K
• Training the immune system
• Producing neurotransmitters such as serotonin (90% of which is produced in the gut!)
• Protecting against harmful pathogens

This is why the gut is often called “the second brain.” There is a direct connection between the gut and the brain, known as the gut-brain axis, which allows what happens in one to affect the other.

The Microbiota and Its Impact on Mental and Immune Health

The connection between the gut and the brain has been one of the most fascinating scientific discoveries in recent years. What was once considered solely a digestive organ is now recognized as a complex system that communicates directly with the brain through what is known as the gut-brain axis. This communication pathway allows changes in the gut microbiota to influence not only digestion, but also emotional state, behavior, and even the way our body responds to disease.

In the field of mental health, various studies have shown that an imbalance in the gut microbiota — known as dysbiosis — may be linked to disorders such as anxiety, depression, and chronic fatigue. This is because many intestinal bacteria participate in the production of key neurotransmitters such as serotonin, which is responsible for generating feelings of well-being and happiness. In fact, it is estimated that more than 90% of the body’s serotonin is produced in the gut, which explains why digestive discomfort is often accompanied by emotional disturbances.

On the other hand, the microbiota plays a crucial role in the functioning of the immune system. Approximately 70% to 80% of the body’s immune cells are located in the gut, making it a true defense center. When the microbiota is balanced, it helps train the immune system to respond appropriately to viruses, bacteria, and toxins. However, when this balance is disrupted, it can lead to a state of chronic low-grade inflammation that, over time, weakens our defenses and increases the risk of developing autoimmune diseases, allergies, recurrent infections, and even metabolic conditions such as obesity and type 2 diabetes.

In addition, the modern lifestyle — characterized by low-fiber diets, excessive consumption of ultra-processed foods, frequent antibiotic use, lack of sleep, and high levels of stress — has a direct negative impact on the microbiota. These factors reduce bacterial diversity, promote the growth of harmful microorganisms, and alter the protective functions of the gut. For this reason, caring for the microbiota should not be seen merely as a strategy to improve digestion, but as a fundamental tool for strengthening the immune system, balancing the mind, and preventing disease.

How to Care for Your Microbiota: Practical Guide

Taking care of your microbiota does not have to be complicated. Despite its biological complexity, this intestinal ecosystem responds very positively to simple lifestyle and dietary changes. What you choose to eat, how you manage stress, and how much sleep you get can shape your microbiota day by day, strengthening its diversity and promoting beneficial bacteria. In other words, every daily decision is an opportunity to nourish your health from within.

One of the fundamental pillars of maintaining a balanced microbiota is the regular consumption of fiber-rich foods. Fiber acts as food for the good bacteria in the gut, allowing them to grow, multiply, and perform their functions properly. This type of fiber, known as prebiotic fiber, is naturally found in:

• Garlic
• Onion
• Asparagus
• Leeks
• Artichokes
• Whole grains such as oats
• Less ripe fruits, such as green bananas

Unlike regular fiber, prebiotic fiber not only regulates intestinal transit, but also directly nourishes the microbiota, helping improve its diversity and stability.

Alongside prebiotics, fermented foods have special value for gut health. These foods contain live bacteria, known as probiotics, which can temporarily colonize the intestine and support digestive, immune, and metabolic functions.

• Kefir
• Plain unsweetened yogurt
• Sauerkraut
• Kimchi
• Artisan kombucha are some accessible and effective examples

Including them regularly in your diet can help restore microbial balance, especially after antibiotic treatments or prolonged periods of stress and poor eating habits.

In addition to diet, other lifestyle factors significantly influence the microbiota. Chronic stress, sedentary behavior, lack of sleep, and excessive consumption of ultra-processed foods are silent enemies of intestinal health. Stress, for example, alters intestinal motility and can change bacterial composition within just a few days, causing digestive symptoms such as bloating, gas, constipation, or diarrhea. Sleeping well, staying physically active, and finding time to disconnect are essential habits that work together to protect the balance of the intestinal ecosystem.

Conclusion

Taking care of your microbiota is not a fad or a passing trend. It is a real investment in your long-term health. Starting with small, sustainable changes — such as adding more vegetables to your meals, avoiding added sugars, or choosing fermented options instead of industrialized products — can make a big difference in how you feel and how your body functions. Remember that a healthy gut not only improves digestion, but also strengthens your defenses, helps you manage stress more effectively, and enhances emotional well-being.

Your gut has memory. Every choice you make either builds it up or weakens it. That is why caring for your microbiota is a smart and conscious way to care for your entire body, from the defenses that protect you to the thoughts that accompany you. Today is a good day to start.

BIBLIOGRAPHY

(1) Cryan, J. F., & Dinan, T. G. (2012). Mind-altering microorganisms: the impact of the gut microbiota on brain and behaviour. Nature Reviews Neuroscience, 13(10), 701–712.

(2) Dinan, T. G., & Cryan, J. F. (2017). The microbiome-gut-brain axis in health and disease. Gastroenterology Clinics of North America, 46(1), 77–89.

(3) Belkaid, Y., & Hand, T. W. (2014). Role of the microbiota in immunity and inflammation. Cell, 157(1), 121–141.

(4) Round, J. L., & Mazmanian, S. K. (2009). The gut microbiota shapes intestinal immune responses during health and disease. Nature Reviews Immunology, 9(5), 313–323.

(5) Kau, A. L., Ahern, P. P., Griffin, N. W., Goodman, A. L., & Gordon, J. I. (2011). Human nutrition, the gut microbiome and the immune system. Nature, 474(7351), 327–336.

(6) Valdes, A. M., Walter, J., Segal, E., & Spector, T. D. (2018). Role of the gut microbiota in nutrition and health. BMJ, 361, k2179.

(7) Giulia Enders (2014). La digestión es la cuestión. Editorial Uranito

(8) Michael Mosley (2017). El Código de la Comida: cómo tu flora intestinal puede cambiar tu vida. Editorial Urano.

La entrada Your Second Brain: How the Gut Microbiota Impacts Your Mind, Immunity, and Overall Health se publicó primero en Neolife.

What intermittent fasting is, how it works in the body, its potential benefits, and the risks of applying it incorrectly.

Intermittent fasting has become one of the most popular nutritional strategies in recent years, especially among individuals looking to lose weight. While it can offer metabolic and health benefits, it is not without risks if practiced without proper knowledge or supervision.

Adriana Martín Peral – Neolife Nutrition Unit

What Is Intermittent Fasting?

Intermittent fasting is not a diet per se, but rather an eating pattern that alternates periods of food intake with periods of fasting. It focuses less on what you eat and more on when you eat. Unlike traditional diets, it is not based on restricting specific foods, but on structuring the timing of meals.

Main Types of Intermittent Fasting

16:8 Fasting

This involves fasting for 16 hours and concentrating food intake within an 8-hour window. It is the most popular protocol due to its ease of integration into daily life.

14:10 Fasting

A more flexible version, recommended for beginners or individuals with higher energy demands.

5:2 Method

Five days of normal eating and two non-consecutive days with significantly reduced caloric intake.

Alternate-Day Fasting

Alternates days of normal eating with days of complete or partial fasting. It is more demanding and less sustainable for many people.

How Does Intermittent Fasting Work in the Body?

During the first hours of fasting, the body uses stored glucose in the form of glycogen. Once these reserves are depleted, it begins to rely on body fat as a source of energy.

This process is accompanied by:

• A decrease in insulin levels
• An increase in glucagon
• Activation of cellular repair mechanisms

These changes explain many of the effects associated with intermittent fasting.

Positive Effects of Intermittent Fasting

When properly implemented and adapted to the individual, intermittent fasting may offer several benefits:

1. Improved Insulin Sensitivity

Lower insulin levels promote better blood glucose control, which may be beneficial for individuals with insulin resistance or risk of type 2 diabetes.

2. Fat Loss

By promoting fat utilization as fuel, it may contribute to weight loss, especially when combined with a balanced diet.

3. Metabolic Health

Some studies associate intermittent fasting with improvements in markers such as cholesterol, triglycerides, and blood pressure.

4. Possible Activation of Autophagy

Fasting activates cellular recycling processes known as autophagy, which are linked to cellular health and longevity, although their impact in humans is still under investigation.

Negative Effects if Done Incorrectly

Intermittent fasting is not suitable for everyone, and improper implementation may lead to adverse effects:

1. Nutritional Deficiencies

Reducing eating windows without proper planning may result in insufficient intake of protein, vitamins, and minerals.

2. Digestive Issues and Fatigue

Skipping meals without prior adaptation can cause dizziness, weakness, constipation, headaches, or gastrointestinal discomfort.

3. Unhealthy Relationship with Food

In some individuals, it may promote disordered eating behaviors, binge eating, or a rigid relationship with food.

4. Not Recommended in Certain Cases

It is not advisable for:

• Pregnancy and breastfeeding
• Individuals with eating disorders
• Individuals with eating disorders
• People with certain medical conditions without professional supervision

Common Mistakes When Practicing Intermittent Fasting

• Overeating during the eating window
• Prioritizing ultra-processed foods
• Not meeting protein requirements
• Forcing excessively long fasting periods
• Ignoring the body’s signals

Recommendations for Safe Intermittent Fasting

• Start gradually (14:10 before 16:8)
• Prioritize fresh, nutrient-dense foods
• Maintain proper hydration
• Adapt fasting to lifestyle and activity level
• Consult a nutrition professional

Conclusion

Intermittent fasting can be a useful tool within a healthy eating approach, but it is not a universal solution. Its success depends on the individual, the context, and proper nutritional planning. When practiced with knowledge and supervision, it may provide benefits; when applied incorrectly, it can lead to more harm than good.

BIBLIOGRAPHY

(1) Mattson, M. P., Longo, V. D., & Harvie, M. (2017). Impact of intermittent fasting on health and disease processes. Ageing Research Reviews, 39, 46–58.

(2) Anton, S. D., et al. (2018). Flipping the metabolic switch: understanding and applying the health benefits of fasting. Obesity, 26(2), 254–268.

(3) Patterson, R. E., & Sears, D. D. (2017). Metabolic effects of intermittent fasting. Annual Review of Nutrition, 37, 371–393.

(4) Organización Mundial de la Salud (OMS). Healthy diet factsheet.

La entrada Ayuno intermitente: qué es, beneficios y riesgos de una práctica cada vez más popular se publicó primero en Neolife.

Not everything is about the glycemic index, and you don’t need to “eat unlimited protein.”

If you want to lose body fat, you have probably heard that you should avoid foods with a high glycemic index and significantly increase your protein intake. But what truly matters? Does the glycemic index influence weight loss as much as we think? And how much protein do you actually need? Below, we clarify both concepts based on scientific evidence and practical application.

Adriana Martín Peral – Neolife Nutrition Unit

What Is the Glycemic Index?

The glycemic index (GI) measures how quickly a carbohydrate-containing food raises blood glucose levels compared with pure glucose.

• High GI → rapid rise in blood glucose
• Low GI → slower rise

However, there is a limitation: the glycemic index is measured under isolated conditions, with the food consumed alone and in standardized quantities. In real life, we eat combinations of foods. For this reason, a more practical concept is glycemic load, which takes into account both the quality and the quantity of carbohydrates.

Does the Glycemic Index Matter for Weight Loss?

Evidence shows that:

• Low-GI diets may improve glycemic control.
• They can be particularly beneficial in individuals with insulin resistance.
• However, when calories and protein intake are controlled, GI alone does not determine fat loss.

The factors that most strongly influence weight loss are:

• Sustained caloric deficit
• Adequate protein intake
• Long-term adherence

A high-GI food does not “cause weight gain” by itself. The overall dietary context is what truly makes the difference.

Protein: The Key Player in Fat Loss

If there is one macronutrient that becomes especially important when aiming to lose fat without losing muscle mass, it is protein. Why?

• It increases satiety.
• It reduces the loss of muscle mass during a caloric deficit.
• It has a higher thermic effect (the body expends more energy digesting it).

This leads to an important question:

How Much Protein Is Actually Needed for Weight Loss?

The standard recommendation for the general population is 0.8 g/kg/day.

However, for fat loss and preservation of muscle mass, current evidence suggests an intake of 1.6–2.2 g/kg of body weight per day. That said, before increasing protein intake, it is important to ensure that there is no medical condition requiring a different nutritional approach. Protein intake should always be individualized and supervised by a healthcare professional.

Practical example:

A person weighing 70 kg who wants to lose fat should consume between 112 and 154 g of protein per day. This does not mean “eating unlimited protein.” Beyond this range, the benefits do not increase significantly.

What You Should Really Focus On

Instead of becoming overly concerned with the glycemic index:

• Ensure sufficient protein intake at each meal.
• Combine carbohydrates with fiber, fats, and protein.
• Prioritize minimally processed foods.
• Evaluate your long-term adherence rather than focusing exclusively on GI.

Improving your daily protein distribution will have a much greater impact on body composition than focusing solely on the glycemic index.

Conclusion

The glycemic index can be a useful tool in certain contexts, particularly in individuals with metabolic disturbances, but it is not the decisive factor when it comes to fat loss. What truly makes a difference is maintaining a sustainable caloric deficit, ensuring adequate protein intake, and building a dietary pattern that can be maintained over time.

Within this framework, protein plays a key role because it helps preserve muscle mass, improves satiety, and facilitates adherence to the nutritional plan. However, more is not always better, and recommendations should be adjusted according to each individual’s characteristics and health status.

Ultimately, losing weight does not depend on demonizing foods based on their glycemic index or consuming unlimited protein, but rather on applying strategy, scientific evidence, and long-term consistency.

BIBLIOGRAPHY

(1) Thomas, D., Erdman, K., & Burke, L. (2016). Position of the Academy of Nutrition and Dietetics: Nutrition and Athletic Performance.

(2) Morton, R. W., et al. (2018). Protein intake and muscle mass: A meta-analysis.

(3) Wycherley, T. P., et al. (2012). Effects of energy-restricted high-protein diets on body composition.

(4) Livesey, G., et al. (2008). Glycemic index and body weight: systematic review and meta-analysis.

La entrada Glycemic Index and Protein: What Really Matters If You Want to Lose Weight se publicó primero en Neolife.

The menopausal transition promotes changes in body composition. We analyze the hormonal factors involved and the most effective nutritional strategies.

During menopause, many women experience weight gain, particularly in the abdominal area. Although this is often attributed exclusively to “hormones,” the phenomenon is more complex. The decline in estrogen levels, changes in muscle mass, and metabolic adaptations all play a significant role. We review what actually happens and how to intervene effectively.

Adriana Martín Peral – Neolife Nutrition Unit

Hormonal Changes in Menopause: What Really Happens?

Menopause is characterized by a progressive decline in estrogen levels, particularly estradiol. This hormonal shift impacts:

• Redistribution of body fat toward a more android (abdominal) pattern.
• Decreased basal energy expenditure.
• Increased insulin resistance.
• Higher cardiometabolic risk.

Estrogens play a protective role at the metabolic level. Their decline favors greater accumulation of visceral fat, which is metabolically active and associated with inflammation.

Is It Only a Hormonal Issue?

Not exclusively. In addition to hormonal changes, other factors are involved:

• Loss of Muscle Mass (Sarcopenia)

From the ages of 40–50 onward, there is a progressive decline in muscle mass if no strength stimulus is present. Since muscle is metabolically active tissue, its reduction decreases daily energy expenditure.

• Decreased Total Energy Expenditure

Lower levels of spontaneous physical activity, changes in sleep patterns, and increased stress contribute to a sustained positive energy balance.

• Changes in Appetite and Satiety

Some women report increased cravings for energy-dense foods, possibly related to hormonal fluctuations and sleep disturbances.

Evidence-Based Nutritional Strategies

• Prioritize Adequate Protein Intake: A sufficient protein intake (approximately 1.2–1.6 g/kg/day depending on individual profile) helps to:
  • Preserve muscle mass.
  • Improve satiety.
  • Support glycemic control.

Distributing protein evenly throughout the day optimizes muscle protein synthesis.

• Strength Training + Nutrition: Resistance training is key to counteracting age- and menopause-related muscle loss. When combined with adequate protein intake, it improves body composition beyond what is reflected on the scale.
• Control Energy Density: Reduce ultra-processed foods and prioritize:
  • Vegetables
  • Whole fruit
  • Legumes
  • Healthy fats (extra virgin olive oil, nuts)
  • Lean protein sources

This approach supports satiety while lowering overall caloric load.

• Fiber and Metabolic Health: A high fiber intake (25–35 g/day) improves:
  • Insulin sensitivity
  • Lipid profile
  • Gut health

The gut microbiota also appears to play a relevant role in weight regulation during this stage.

Sleep and Stress

Sleep deprivation is associated with greater insulin resistance and increased appetite. Therefore, intervention should be comprehensive and lifestyle-oriented.

What Does NOT Work

• Extremely restrictive diets maintained over time.
• Complete elimination of food groups without clinical indication.
• Focusing exclusively on weight without assessing body composition.

During menopause, the goal should be to improve body composition and metabolic health—not simply reduce body weight.

Conclusion

Weight gain during menopause is not inevitable, but it does require a different approach. The combination of appropriate nutrition, strength training, and a comprehensive lifestyle strategy can improve body composition and reduce cardiometabolic risk during this stage of life.

BIBLIOGRAPHY

(1) Lovejoy JC et al. Increased visceral fat and decreased energy expenditure during menopause.

(2) Lizcano F, Guzmán G. Estrogen deficiency and the origin of obesity during menopause.

(3) Stuenkel CA et al. Treatment of symptoms of menopause.

(4) Messier V et al. Menopause and sarcopenia: impact on metabolic health.

La entrada Menopause and Weight Gain: The Real Role of Hormones and How to Address It Through Nutrition se publicó primero en Neolife.

Ultra-processed foods are not designed merely to nourish us: they are carefully engineered to make us want to keep eating. It is no coincidence that opening a bag of potato chips or a packet of cookies almost always ends with “just a little more,” until, before we realize it, the package is empty.

These products (snacks, sweets, fast food…) may seem harmless, but behind their intense flavor, perfect texture, and irresistible aroma lie hours of testing, formulas, and fine-tuning aimed at stimulating our senses and activating the brain’s reward system. What exactly do these foods contain that makes them so hard to stop eating? Why can a single bite turn into a chain of cravings? The answer lies in their design: a precise combination of ingredients, textures, and sensory stimuli that subtly encourages us to keep eating.

Adriana Martín Peral – Neolife Nutrition Unit

What Are Ultra-Processed Foods?

Ultra-processed foods are products that undergo multiple industrial transformations and contain a long list of ingredients you would not normally find in a home kitchen. Beyond basic components such as wheat, corn, or milk, they often include added sugars, low-quality fats, flavor enhancers, additives, and texturizers, all designed to improve taste, appearance, and shelf life. The goal of these processes is not only to extend the product’s durability but also to create a perfect texture, an intense flavor, and a pleasurable eating experience, all while keeping production costs low. This is why, although they may appear to be simple snacks or ready-to-eat meals, each bite involves food engineering designed to capture our attention and keep us eating for longer.

How Ultra-Processed Foods Create Cravings

It is no coincidence that it is so difficult to stop after opening a bag of chips or a packet of cookies. Ultra-processed foods are designed to activate the brain’s reward system, releasing dopamine and making each bite more appealing than the last. This is achieved through what experts call the “irresistible triad”: sugar, fat, and salt. The precise combination of these three elements is carefully calibrated to maximize pleasure without becoming overwhelming, stimulating the release of dopamine, the neurotransmitter associated with pleasure and motivation.

Added to this is the concept of the “bliss point,” which describes the exact level of sugar, fat, or salt that produces the greatest satisfaction. Companies conduct extensive sensory testing to find the perfect proportion, ensuring that each bite is highly pleasurable and difficult to abandon.

Moreover, the texture and aroma of these foods are engineered to reinforce pleasure. The perfect crunch of potato chips, the melt-in-your-mouth smoothness of chocolate, or the softness of certain industrial breads send signals of freshness and flavor to the brain, increasing the compulsion to eat more. Even the low satiety of many ultra-processed foods (due to their low fiber or protein content) contributes to the brain continuing to ask for “just a little more,” even when the stomach is already full.

Ultra-processed foods do not rely solely on sugar, fat, and salt. Aromas and flavor enhancers also play a role in making each bite more irresistible. Ingredients such as monosodium glutamate (MSG), artificial flavorings, and industrial aromas intensify taste so that the brain perceives the food as more flavorful than it truly is. These additives provide no nutritional value but deceive our senses, generating a sense of pleasure that encourages continued consumption. It is a small chemical and sensory trick that, combined with other factors, makes stopping extremely difficult.

Another key factor is that many ultra-processed foods generate low satiety, meaning we do not feel sufficiently full despite having consumed many calories. This is because they tend to be calorie-dense but poor in fiber and protein—nutrients that help regulate appetite. As a result, the brain continues to send signals of hunger or craving even after sufficient energy intake. This combination of low satiety and high sensory reward turns these foods into an almost automatic cycle of eating more, again and again.

Marketing and Environment: Induced Cravings

It is not only ingredients and sensory engineering that make ultra-processed foods hard to resist; marketing and environment also play a key role in generating cravings and impulsive purchases. Bright packaging colors, eye-catching designs, and noisy wrappers are carefully designed to capture attention and associate the product with fun or pleasure.

In addition, many of these products are sold in small portions that seem harmless, leading us to underestimate how much we are consuming. This psychological design makes opening a package far more tempting and easy to eat “without guilt,” even though you may end up consuming more than planned.

Targeted advertising further reinforces these habits—not only in children, but also in adults. Commercials, social media, and promotions associate these foods with happy moments, rewards, or indulgence, creating emotional connections that go beyond simple hunger.

Finally, strategic placement in stores and supermarkets increases impulsive consumption. Positioning snacks at eye level, near checkout counters, or in main aisles makes them almost impossible to ignore. Even if you go shopping for a single ingredient to cook, constant exposure to these products activates the desire to buy and consume them immediately.

Together, these marketing and environmental factors do not merely sell the product—they manipulate our cravings, reinforcing the habits that ultra-processed foods have already begun to create through taste and texture.

Practical Example: Why Potato Chips Crunch the Way They Do

The crunch of potato chips does not happen by chance; it is the result of careful sensory engineering. Brands specifically adjust sound and texture so that each bite is highly pleasurable and encourages continued eating.

1. The crunching sound stimulates the brain

The characteristic “crack” activates brain areas associated with pleasure and the perception of freshness. Noisy foods are perceived as fresher, newer, and more desirable, and companies calibrate the hardness and shape of the chips to make the sound as “perfect” as possible. Studies have shown that when the crunch is amplified, people rate chips as tastier, even if they are exactly the same product.

2. Extremely low moisture content

Potato chips are fried until they contain only about 1–2% moisture. This extreme dryness makes their structure fragile, breaking into small fractures when bitten and producing a highly satisfying crunch. With more moisture, they would become chewy or soggy and lose this effect.

3. Porous structure and trapped air

During frying, the water inside the potato rapidly turns into steam, creating small internal bubbles. This microcavity-filled structure causes the chip to break into many particles at once when bitten, producing a more complex and pleasant crunch.

4. Fat and salt coating: the winning combination

The fat coating lubricates the mouth and enhances flavor, while salt intensifies taste and increases salivation. Together, fat and salt make the crunch more pronounced and the eating experience even more rewarding.

5. Crunch equals instant reward

The crunch reaches the ears milliseconds before the mouth perceives it, and the brain interprets it as “delicious.” This signal triggers a small dopamine release, reinforcing the habit of continuing to eat. That is why, even when we are full, sound and texture can push us to eat more than we need.

Conclusion

Ultra-processed foods are not simply foods: they are carefully designed products created to generate cravings. Their combination of flavor, texture, aroma, marketing, and low satiety activates brain reward circuits, creates automatic habits, and makes it difficult to stop—even when the body has already received enough energy. Understanding how these mechanisms work allows us to make more conscious choices and prioritize real foods most of the time, reducing the influence of strategies designed to keep us eating more.

BIBLIOGRAPHY

(1) Monteiro, C. A., Cannon, G., Lawrence, M., et al. (2019). Ultra-processed foods, diet quality, and health using the NOVA classification system. *FAO and Pan American Health Organizat

(2) SINC. Vinculan el consumo de ultraprocesados con síntomas depresivos y cambios en circuitos cerebrales. Agencia SINC. Agencia Sinc

(3) Sánchez Perona, J. “Los alimentos ultraprocesados se diseñan para ser muy apetitosos y fáciles de consumir”. Delegaciones CSIC. delegacion.andalucia.csic.es

(4) National Geographic. Alimentos ultraprocesados y su relación con la salud mental. National Geographic España

(5) El País. ¿Por qué los alimentos procesados son tan adictivos? Esta es la razón científica. Diario El País

(6) National Geographic. ¿Qué es más adictivo, la comida ultraprocesada o el tabaco? National Geographic España

(7) Lavanguardia. Entrevista con Claire Wilcox: “Alimentos con alto contenido en azúcar y ultraprocesados afectan al cerebro …”. La Vanguardia

(8) Business Insider (español). Ultraprocesados tan adictivos como el tabaco, según un nuevo estudio científico. Business Insider España

(9) El Economista. Por qué el cerebro es “adicto” a la comida ultraprocesada (y qué funciones puede alterar). El Economista

(10) El Tiempo. Los alimentos ultraprocesados serían dañinos para el cerebro, según estudio.

La entrada Why You Can’t Eat Just One: The Science Behind Ultra-Processed Foods and Cravings se publicó primero en Neolife.

Small eating habits with real impact (without going crazy).

Nutritional biohacking is the practice of optimizing your body and mind with small, strategic changes. But you don’t need implants or exotic supplements. Sometimes, the basics done right are enough.

Adriana Martín – Neolife Nutrition Unit

Nutritional Biohacking

Feeling more energetic, sleeping better, thinking more clearly… all that without following a strict diet or spending a fortune on exotic supplements. Welcome to the world of nutritional biohacking, a way to optimize your body through smart micro-habits you can start applying today.

The goal isn’t to follow an impossible routine, but rather to understand the key principles that regulate how you feel, eat, and function—and act on them strategically. Here are some simple yet powerful changes, backed by science and by the experience of those already practicing them.

Here’s the minimum effective dose you can do to feel better without complicating your life:

1. Start Eating Later (and Stop Eating Earlier)

Intermittent fasting is not just a trend: studies show that restricting your eating window to 8–10 hours improves insulin sensitivity, reduces inflammation, and supports mental clarity. If you have breakfast at 10 a.m. and dinner before 7 p.m., you’re in the game without extreme effort.

The best part? You don’t need to count calories or follow a specific diet—just give your digestive system a real break.

2. Micro-Doses of Caffeine, Not Energy Bombs

Many of us rely heavily on coffee to kickstart the day, but the ideal approach is small doses spread out: one cup after waking (waiting 60–90 minutes), another at midday, and none after 3 p.m. This way, you avoid the highs and crashes that affect your mood and sleep.

And if you can swap one of those cups for green tea or yerba mate, you’ll get extra benefits such as L-theanine, which smooths caffeine’s effect and boosts focus.

3. Eat Smart Fats for Your Brain

Sixty percent of your brain is made of fat, and what you eat directly affects its performance. Avocado, nuts, eggs, salmon, olive oil, and chia seeds are key allies. Adding these healthy fats not only keeps you fuller for longer but also enhances focus, memory, and mood.

A handful of nuts a day can literally make a difference.

4. Foods That Calm the Mind (Yes, Including Chocolate)

Low levels of magnesium, tryptophan, and zinc have been linked to anxiety and fatigue. You can support your mental well-being with foods like dark chocolate (at least 85%), bananas, spinach, lentils, oats, and plain yogurt.

You don’t need expensive supplements—just make sure your plate has a variety of colors and natural textures. Your nervous system will thank you.

5. Morning Sun

Minimum effective dose: 5–10 minutes without sunglasses.

• It regulates your biological clock (circadian rhythm), improves mood, and supports sleep.
• If it’s winter or you’re indoors, consider a natural light lamp.

Conclusions

You don’t need to make huge sacrifices to start feeling better. Nutritional biohacking is about doing the minimum necessary—but doing it with intention. Small daily changes, applied consistently, can generate a big impact over time.

Start today with just one. Pick the one that resonates most with you. And remember: your body is listening to everything you eat.

BIBLIOGRAPHY

(1) Panda, S., et al. (2016). Time-restricted feeding improves metabolic health. Cell Metabolism.

(2) NIH – Intermittent Fasting in Humans

(3) Haskell, C. F., et al. (2008). The combined effects of L-theanine and caffeine on cognitive performance and mood. Nutritional Neuroscience.

(4) Smith, A. (2002). Effects of caffeine on human behavior. Food and Chemical Toxicology.

(5) Dyall, S. C. (2015). Long-chain omega-3 fatty acids and the brain: a review of studies in depression. CNS & Neurological Disorders.

(6) Harvard Health Publishing: “The truth about fats: the good, the bad, and the in-between”

(7) Barbagallo, M., et al. (2010). Magnesium and aging. Current Pharmaceutical Design.

(8) Sarris, J., et al. (2015). Nutritional medicine as mainstream in psychiatry. The Lancet Psychiatry.

(9) Nehlig, A. (2013). The neuroprotective effects of cocoa flavanols. British Journal of Clinical Pharmacology.

(10) Asprey, D. (2014). The Bulletproof Diet. (referencia popular, no científica, pero influyente en la cultura del biohacking).

(11) Rhonda Patrick, PhD – Bioquímica especializada en nutrición funcional y salud cerebral.

(12) ZOE Health App / Tim Spector – Estudios sobre microbioma y alimentación personalizada.

La entrada Nutritional Biohacking: The Minimum You Can Do to Feel Better se publicó primero en Neolife.