Common Myths, Examined
Where popular nutrition claims diverge from the evidence
“Eating late at night makes you fat.”
Total daily calorie intake, not the clock time of meals, determines weight change in controlled studies matching total intake across different eating schedules[49]. Late eating is associated with weight gain mainly because it correlates with higher total intake and poorer food choices in free-living populations, not because of the time itself.
“You need to eat small meals constantly to keep your metabolism going.”
Metabolic rate is driven by total food intake, bodyweight, and activity level — not how many meals it's split across[49].
“Detox diets and juice cleanses remove toxins.”
The liver and kidneys continuously process and remove waste products regardless of specific food or juice intake; no controlled study has identified a measurable additional detoxification benefit from cleanse-style protocols beyond what normal organ function already provides.
“Natural and organic foods are automatically healthier or lower-calorie.”
"Organic" describes farming method, not nutrient content or calorie density — organic sugar is still sugar, and several studies have found no consistent nutritional superiority of organic over conventional produce. The environmental case is genuinely mixed rather than a simple win for organic: it typically means lower pesticide runoff and better soil health per hectare, but also meaningfully lower yield per hectare — commonly cited around 19–25% lower — which can mean more total land used for the same amount of food[70]. A real trade-off, not a one-sided argument either way.
“Gluten is harmful unless you have coeliac disease.”
For the roughly 99% of people without coeliac disease or a diagnosed non-coeliac gluten sensitivity, gluten itself has no demonstrated harm. Many people who feel better avoiding gluten are likely responding to a simultaneous reduction in refined, processed wheat products, or to FODMAPs rather than gluten specifically (see Section 13 for the evidence behind that distinction).
“Sugar is uniquely addictive, comparable to drugs.”
Animal studies showing sugar-seeking behaviour are frequently overstated when applied to humans; human studies do not show the same withdrawal or escalation patterns characteristic of substance dependence. Sugar is calorie-dense and palatable, which makes overconsumption easy, but this is a different mechanism from pharmacological addiction.
| Myth | Verdict |
|---|---|
| Eating late at night makes you fat | False — total intake matters, not the clock |
| Small, frequent meals "boost" metabolism | False — meal frequency is irrelevant at matched intake |
| Detox diets/juice cleanses remove toxins | False — your liver and kidneys already do this |
| Organic food is healthier/lower-calorie | False — describes farming method, not nutrition |
| Gluten is harmful without coeliac disease | False for ~99% of people — see Section 13 |
| Sugar is addictive like a drug | Overstated — palatable and easy to overeat, not pharmacologically addictive |