> Burn more calories than you take in, you lose weight.
Wrong. Exercise burns calories, but also promotes muscle formation. Forming muscle, pound per pound, takes less calories than burning fat produces. So you can have a calorie deficit while gaining more weight in muscle than is lost in fat.
Depending on exercise patterns, precise nutrition, and other factors, a calorie deficit can result in:
Weight loss and decrease in body fat % (net weight loss disproportionately from fat),
Weight loss with no change in body fat %,
Weight loss and increase in body fat % (weight loss from disproportionately from muscle),
Weight gain and decrease in body fat % (weight loss from fat offset by greater weight gain in muscle.)
(I don't think there is any way for a calorie deficit to result in weight gain and increase in body fat % simultaneously, but I may be overlooking something.)
Additionally, changes in absorption, metabolic efficiency, and other factors can make what is assumed to be a calorie surplus based on food/exercise logs into a deficit or vice versa; both the "in" and "out" side of calories in vs. calories out are, absent a lot of detailed measurement most people aren't undergoing even in inpatient medical settings, a lot more approximate and have a lot more bundled assumptions than people tend to think.
Wrong. Exercise burns calories, but also promotes muscle formation. Forming muscle, pound per pound, takes less calories than burning fat produces. So you can have a calorie deficit while gaining more weight in muscle than is lost in fat.
Depending on exercise patterns, precise nutrition, and other factors, a calorie deficit can result in:
Weight loss and decrease in body fat % (net weight loss disproportionately from fat), Weight loss with no change in body fat %, Weight loss and increase in body fat % (weight loss from disproportionately from muscle), Weight gain and decrease in body fat % (weight loss from fat offset by greater weight gain in muscle.)
(I don't think there is any way for a calorie deficit to result in weight gain and increase in body fat % simultaneously, but I may be overlooking something.)
Additionally, changes in absorption, metabolic efficiency, and other factors can make what is assumed to be a calorie surplus based on food/exercise logs into a deficit or vice versa; both the "in" and "out" side of calories in vs. calories out are, absent a lot of detailed measurement most people aren't undergoing even in inpatient medical settings, a lot more approximate and have a lot more bundled assumptions than people tend to think.