Free Resource — NM Nutrition Limited
Nutrition myth busters
The nutrition world is full of myths, misinformation, and diet culture claims that can be harmful — or just confusing. Here are 15 of the most common nutrition myths, debunked with evidence-based science.
- 15 myths debunked
- Evidence-based science
- NM Nutrition Limited • 2026
Myth 1
Myth
Carbs make you fat
Fact
No single macronutrient causes weight gain. Excess calories — from any source — lead to weight gain. Wholegrains, legumes, and vegetables are carbohydrate-rich and associated with healthy weight. The type and amount of carbohydrate matters far more than the nutrient itself.
Myth 2
Myth
Fat is bad for you
Fact
Dietary fat is essential for brain function, hormone production, vitamin absorption (A, D, E, K), and cell membrane integrity. Unsaturated fats from olive oil, avocados, nuts, and oily fish are actively beneficial. It is trans fats and excessive saturated fats that are associated with harm.
Myth 3
Myth
You need to detox / cleanse your body
Fact
Your liver, kidneys, lungs, and lymphatic system detoxify your body continuously and effectively. No juice cleanse, tea, or supplement can enhance this process. ‘Detox’ products are not supported by clinical evidence and can be expensive and unnecessary.
Myth 4
Myth
High-protein diets damage your kidneys
Fact
In healthy individuals, high protein intake does not damage kidney function. This concern applies only to those with pre-existing chronic kidney disease. For healthy people, higher protein supports satiety, muscle retention, and metabolism.
Myth 5
Myth
Eating at night causes weight gain
Fact
Weight gain is determined by total calorie balance over time, not the time of eating. However, late-night eating is often associated with mindless snacking on calorie-dense foods. The behaviour, not the clock, is the issue.
Myth 6
Myth
All calories are equal
Fact
While calories govern energy balance, they are not metabolically identical. 100 calories of almonds impacts hunger, blood sugar, and gut bacteria very differently to 100 calories of a sugary drink. Food quality and composition profoundly affect satiety, hormones, and long-term health.
Myth 7
Myth
Skipping breakfast is bad for you
Fact
Breakfast is neither essential nor universally beneficial. Research on breakfast and metabolism is mixed. What matters is total daily nutrient intake. Some people thrive eating breakfast; others do well with intermittent fasting approaches. Listen to your hunger cues.
Myth 8
Myth
Organic food is always healthier
Fact
Organic farming reduces synthetic pesticide use, which may have environmental benefits. However, the nutritional difference between organic and conventional produce is generally small. Eating more fruit and vegetables — organic or not — is far more important than choosing organic over conventional.
Myth 9
Myth
Gluten is harmful to everyone
Fact
Gluten is harmful only to those with coeliac disease (~1% of the population) or non-coeliac gluten sensitivity. For the vast majority, gluten-containing wholegrains like oats and wholegrain bread are nutritious and well-tolerated.
Myth 10
Myth
You need supplements to be healthy
Fact
A varied, balanced diet provides most people with sufficient nutrients. Supplements are indicated for specific deficiencies or life stages (folic acid in pregnancy, Vitamin D in winter, B12 for vegans). Supplements do not replace whole foods and should not be taken without reason.
Myth11
Myth
Eating more protein automatically builds muscle
Fact
Muscle growth requires both adequate protein AND progressive resistance training. Protein provides the building blocks; exercise provides the stimulus. Eating excess protein without training simply contributes to overall calorie intake.
Myth 12
Myth
Diet foods and ‘low fat’ products help you lose weight
Fact
Low-fat products often replace fat with added sugar, refined starch, or artificial additives to maintain taste. They can be more calorie-dense than expected and less satisfying than the full-fat version. Always read the full nutrition label, not just the marketing claim.
Myth 13
Myth
Fruit is too high in sugar to eat freely
Fact
Whole fruit contains fibre, water, vitamins, minerals, and antioxidants alongside naturally occurring sugars. The fibre slows glucose absorption, preventing blood sugar spikes. Whole fruit is associated with reduced disease risk. Fruit juice should be limited to 150ml per day.
Myth 14
Myth
You need to eat every 2–3 hours to keep your metabolism going
Fact
Meal frequency has minimal impact on metabolic rate in controlled studies. The total amount and quality of food consumed matters far more than how often. Eat in a pattern that supports your hunger, lifestyle, and energy — whether that is 3 meals or 5 smaller ones.
Myth 15
Myth
Superfoods are the key to good health
Fact
‘Superfood’ is a marketing term, not a scientific classification. Blueberries, kale, and chia seeds are nutritious, but so are carrots, oats, and lentils. Dietary patterns — the overall combination of foods eaten consistently — determine health outcomes, not individual foods.
Sources: British Dietetic Association • NHS Eat Well Guide • European Food Safety Authority • American Journal of Clinical Nutrition • PubMed peer-reviewed literature.
This guide is for educational purposes and does not constitute medical advice. © NM Nutrition Limited 2026.
This guide is for educational purposes and does not constitute medical advice. © NM Nutrition Limited 2026.
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