When people who are overweight increase their aerobic exercise from 1,500 to 3,000 calories burned per week, their bodies reduce energy use by a similar amount in both cases—around 950 to 1,000...
Mechanism
Synthesis from 1 study
When you exercise, your stomach and gut send signals to your brain that make you hungrier and less full — but after a certain amount of exercise, those signals stop getting stronger, even if you work out more. That’s why eating more to make up for extra calories doesn’t keep increasing — your body...
Most probable mechanism
When you exercise a lot, your body senses that you're burning more energy than usual, so it changes the levels of two key hormones: one makes you feel hungrier and the other makes you feel less full. This pushes you to eat more without even realizing it, which cancels out some of the calories you burned. But after a certain point, these hormone changes don't get any stronger, even if you exercise more — so your hunger doesn't keep rising, and compensation stops increasing.
Aerobic exercise creates a sustained energy deficit that activates homeostatic signaling pathways in the gastrointestinal tract and hypothalamus
Ghrelin-secreting cells in the stomach increase production of acylated ghrelin, the active hunger-stimulating hormone
Intestinal L-cells reduce secretion of glucagon-like peptide-1 (GLP-1), a satiety signal that normally suppresses appetite
Elevated acylated ghrelin and reduced GLP-1 act on hypothalamic nuclei to increase hunger perception and reduce satiety
Increased hunger and reduced satiety drive elevated energy intake, partially offsetting exercise-induced energy expenditure
The magnitude of hormonal changes plateaus at moderate exercise levels, so further increases in energy expenditure do not produce proportionally greater hormonal or intake responses
Less supported by current evidence, but not ruled out
Exercise might make food seem more rewarding to the brain, making people more likely to eat even when they're not hungry. But in this study, food reward actually went down, which suggests this isn't the main driver — though it might still play a minor or variable role.
Aerobic exercise creates an energy deficit that activates mesolimbic dopamine pathways involved in food reward
Neural circuits in the nucleus accumbens increase the motivational value of food, enhancing food-seeking behavior
Increased food reinforcement leads to higher energy intake independent of hunger signals
In this study, food reinforcement decreased after training, contradicting the expected direction and suggesting this pathway may not drive compensation or may adapt differently in overweight individuals
Evidence from Studies
Supporting (1)
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Energy compensation in response to aerobic exercise training in overweight adults.
Contradicting (0)
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