Nutrition Myths That Won't Seem to Die

This myth gained traction during the low-fat diet era of the 1980s and 1990s, when fat was cast as the dietary villain. In reality, fat is an essential macronutrient. It supports hormone production, helps absorb fat-soluble vitamins (A, D, E, and K), and keeps you feeling full. Unsaturated fats — found in foods like avocados, olive oil, and nuts — are associated with heart health in a substantial body of research. Even saturated fat, which warrants moderation, doesn't behave the way the old myth suggests. Excess calories from any source — fat, carbohydrates, or protein — contribute to weight gain. Fat is not uniquely to blame.

The "8x8" rule (eight 8-ounce glasses per day) is widely cited but has no strong scientific foundation as a one-size-fits-all prescription. The figure may have originated from a 1945 U.S. dietary guideline that was largely misquoted — the original note included water from food sources. Much of your daily fluid intake comes from what you eat, especially fruits, vegetables, and other water-containing foods. Thirst is generally a reliable indicator for most healthy adults. Athletes, people in hot climates, and those with certain medical conditions do have elevated needs, but that's precisely why a blanket number doesn't serve everyone equally.

Carbohydrates became a dietary scapegoat in the same era that fat did. While very low-carbohydrate diets can lead to short-term weight loss for some people, the mechanism is calorie reduction — not something uniquely harmful about carbs themselves. Whole food sources of carbohydrates, including legumes, whole grains, fruits, and vegetables, are consistently associated with better health outcomes in large population studies. They also supply fibre, which most people don't get enough of. Dietary fibre plays a significant role in digestion, blood sugar regulation, and satiety. Refined carbohydrates — white bread, sugary drinks, heavily processed snacks — are worth moderating, but that's not the same as avoiding all carbohydrates.

Calories don't carry a clock. The body doesn't store food as fat more readily after a certain hour. What does happen is that late-night eating is often associated with mindless snacking on calorie-dense foods, which can push total daily intake higher — that's the actual driver. If your total calorie intake is appropriate for your needs, eating dinner at 9 p.m. won't cause weight gain on its own. Evening hunger can also be a signal that earlier meals weren't substantial enough — something worth examining if late-night eating feels compulsive. For more on how meal timing and composition affect how you feel, post-lunch energy crashes explores what meal structure actually does to energy levels.

Deliberately skipping meals — particularly breakfast — is often framed as an easy calorie-cutting strategy. For some people following structured intermittent fasting protocols under guidance, controlled eating windows can be useful. But casually skipping meals without a plan tends to backfire: hunger hormones like ghrelin increase, satiety hormones decrease, and food choices later in the day tend to shift toward higher-calorie, lower-nutrient options. Regular, balanced meals help maintain steadier blood sugar and more consistent energy. The quality and composition of those meals matters more than the exact timing — which is something exercise myths share in common with nutrition myths: the simple-sounding rule often obscures a more nuanced reality.