Bodyfat myths, checked
What people believe about losing fat, why it sounds right, and what is true.
No Does the fat-burning zone matter?
No. Easy exercise burns a bigger share of fat while you do it, but fat lost over weeks depends on the total calories you burn and eat. Trials found the same result.
No Can you burn fat from one spot?
No. Crunches don't burn belly fat and arm work doesn't slim your arms. Trials keep finding that fat leaves from all over. What you can choose is the muscle underneath.
No Does eating breakfast speed up your metabolism?
No. Eating breakfast, or many small meals, doesn't raise your metabolism. In trials, breakfast eaters ate more and lost no more weight. Eat the meals that keep you full.
Sort of Does eating too little put you in starvation mode?
Sort of. Dieting makes you burn a bit less than your smaller size explains, but never enough to stop a real deficit. A stall usually means a smaller cut than you think.
Not the way you think Does insulin from carbs make you store fat?
Not the way people say. Insulin steers fuel after a meal, but in careful feeding studies cutting carbs took off no more fat than cutting fat at the same calories.
Not until about 60 Does your metabolism slow down after 30?
Not until about 60. In a study of 6,421 people, metabolism adjusted for size held steady from 20 to 60. Midlife gain comes mostly from moving less and losing muscle.
No Does sweating more burn more fat?
No. Sweat is about 99% water, and the weight you lose sweating comes back when you drink. Fat leaves mostly as carbon dioxide you breathe out. Judge a workout by work.
No Does muscle turn into fat when you stop lifting?
No. Muscle and fat are different tissues, and one can't become the other. Stop lifting and muscle shrinks, and if you eat the same, fat grows. It only looks like a swap.
Yes, but Is a calorie just a calorie?
Yes, for fat loss the calorie gap decides it. But foods change how many calories you end up eating, how many you burn digesting them and how much muscle you keep.
