If you’ve ever felt confused by contradictory information about nutrition — one week eggs are villains, the next they’re superfoods; today gluten is bad for everyone, tomorrow it’s exaggerated — know that you’re not alone. In 2026, with social media amplifying every new trend and every nutrition guru gaining millions of followers, navigating the world of healthy eating has become more challenging than ever. Misinformation spreads quickly, and many dietary myths — some with decades of history — still confuse much of the population.
The problem is that believing incorrect information about food can lead to behaviors that aren’t good for you: unnecessary restrictions, excessive guilt when eating, spending on expensive products that don’t deliver what they promise, and in some cases, even health risks. That’s why understanding what science actually says — clearly, without sensationalism — is an important step toward building a more peaceful and balanced relationship with food.
This article doesn’t aim to prescribe diets or tell you what you should eat. The idea is quite the opposite: to demystify circulating ideas, present what studies and health organizations recognize so far, and remind you that each person has unique needs. For individual guidance, the way forward is always to talk with a trusted nutritionist or doctor.
Myth 1: “Carbohydrates Make You Fat and Should Be Avoided”
This is perhaps the most persistent myth of the last few decades. The idea that carbohydrates are largely responsible for weight gain has led many people to eliminate bread, rice, pasta, and fruits from their plates — and to feel guilty when consuming them.
The World Health Organization (WHO) and Brazil’s Ministry of Health recognize carbohydrates as essential macronutrients, being the primary energy source for the body, especially for the brain and muscles. What science indicates is that the type and quantity make a difference, not the presence of the nutrient itself.
Carbohydrates found in whole grain foods, legumes, fruits, and vegetables typically bring fiber, vitamins, and minerals that contribute to proper body functioning. Excessive consumption of added sugars and ultraprocessed products — regardless of the predominant macronutrient — is what studies associate with negative health outcomes.
Overall caloric imbalance, sedentary lifestyle, and various other factors influence body weight in a far more complex way than a single nutrient could explain.
Myth 2: “Detox Foods Clean the Body”
Green juices, miracle teas, three-day diets with specific ingredients — the detox market grows every year. The promise is appealing: “cleanse” the body, eliminate toxins, and reset metabolism. The problem is that the scientific concept simply doesn’t hold up that way.
The human body already has a natural and highly efficient system for filtering and eliminating substances: liver, kidneys, lungs, and skin perform this work continuously, without needing special products. There is no robust scientific evidence published in peer-reviewed journals proving that specific juices or diets “detoxify” the body in any special way.
This doesn’t mean consuming more fruits, vegetables, and water is useless — quite the opposite, these habits can contribute to proper body functioning. But attributing this effect to a specific product as if it were magical cleaning is marketing, not science.
Myth 3: “Gluten Is Bad for Everyone”
In recent years, gluten-free products have taken up entire supermarket shelves, often surrounded by an aura of “healthier.” But what does science say?
Gluten is a protein found in wheat, rye, and barley. For people with celiac disease — an autoimmune condition diagnosed through medical tests — gluten consumption causes serious damage to the small intestine and must be strictly avoided. There is also non-celiac gluten sensitivity, a condition still being studied and that should be evaluated by a healthcare professional.
For most of the population without these conditions, available studies don’t indicate that removing gluten brings health benefits. On the contrary: some industrialized gluten-free products even have more sugar and fat than conventional versions to compensate for texture.
If you suspect an intolerance or sensitivity to any food, the safest course is to consult a doctor before making restrictions on your own.
Myth 4: “Eating Fat Is Bad for the Heart”
For decades, fat was pointed out as the great villain of cardiovascular disease. This idea led to the boom of “light” and “fat-free” products in the 1980s and 1990s — many of them loaded with sugar to compensate for taste. Today, scientific understanding is more refined.
It’s known that the type of fat matters a lot. Unsaturated fats found in foods like olive oil, avocado, nuts, and fatty fish are typically associated in studies with cardiovascular health benefits when part of a balanced diet. Industrial trans fats — present in ultraprocessed products — are consistently associated with heart risks by various research and WHO recommendations.
Saturated fats, found in meat and dairy, occupy a middle ground debated in current scientific literature: the impact can vary depending on the food and the person’s overall dietary context.
Myth 5: “Vitamin Supplements Are Essential for Good Health”
With the popularization of supplements, the idea that you need to take vitamins daily to be healthy has become common. But reality is more nuanced.
For most people who eat even minimally varied diets, supplements aren’t necessary and don’t replace the benefits of a balanced diet with real foods. Studies suggest that nutrients obtained through food interact with each other in complex ways that an isolated supplement rarely reproduces.
There are, indeed, situations where supplementation may be indicated: pregnant women (such as with folic acid), elderly people, people with diagnosed deficiencies, strict vegans or vegetarians, among others. But this indication should always come from a healthcare professional, based on tests and individual evaluation.
Taking supplements on your own without real need, besides being expensive, can in some cases be harmful — fat-soluble vitamins like A, D, E, and K, for example, accumulate in the body and in excess can cause adverse effects.
Myth 6: “Natural Food Is Always Safe in Any Amount”
“It’s natural, so there’s no problem.” This logic seems reasonable, but it’s a dangerous oversimplification. The toxicity of any substance — including natural ones — depends on the dose and context.
Nutmeg, for example, is a common spice, but in large quantities can cause toxic effects. Medicinal herbs can interact with medications. And even nutritious foods like liver, rich in vitamin A, can be problematic if consumed in excess frequently.
This doesn’t mean natural foods should be feared — quite the opposite, a diet based on natural and minimally processed foods is widely recommended by Brazil’s Food Guide for the Population, from the Ministry of Health. But “natural” isn’t an automatic synonym for “risk-free in any dose,” and balance remains the key word.
When to Seek Professional Healthcare
Navigating so much information alone can be exhausting — and sometimes even harmful. Consider seeking professional guidance if you:
- Suspect food intolerance or allergy (symptoms like bloating, abdominal pain, frequent diarrhea, or reactions after eating)
- Started restricting entire food groups without medical guidance
- Feel intense guilt or anxiety related to eating
- Have health conditions like diabetes, cardiovascular disease, kidney disease, or intestinal conditions
- Are pregnant, breastfeeding, or responsible for feeding children and adolescents
- Notice that your relationship with food is causing emotional distress
Nutritionists and doctors can evaluate your situation individually, considering health history, tests, and real needs. There’s no universal formula that works the same for everyone — and it’s okay to need help finding what works for you.
It’s also worth noting that eating is deeply connected to emotions and mental well-being. If stress and physical health are interfering with your eating habits, that also deserves attention and care.
Building a More Peaceful Relationship With Food
At its core, healthy eating doesn’t need to be perfect or based on rigid rules. Brazil’s Food Guide for the Population, a national reference on this topic, brings a simple and powerful message: prefer natural or minimally processed foods, eat in company when possible, be wary of miracle diets, and listen to your body.
Dismantling myths is a gradual process. Allow yourself to question information that seems absolute, especially when it comes from sources without scientific basis. And remember: eating well isn’t punishment, it’s care — and it should fit your reality, culture, and history.
If you want to better understand how sleep also influences your habits and energy, the article Waking Up Tired Despite Sleeping: Understand What Happens can complement this reading.
This content is informative and educational, and does not replace the evaluation of a healthcare professional. Each person has unique needs: consult a doctor, nutritionist, or other qualified professional before making significant changes to your diet.
