When people do more aerobic exercise, their bodies adjust energy use in a way that doesn't increase proportionally with the extra calories burned. Both moderate and high exercise levels lead to...
Mechanism
Synthesis from 1 study
When you exercise, your body tries to make up for the calories burned by making you hungrier and less full, but only up to a point. Even if you exercise twice as much, your hunger signals don’t get any stronger — so your eating doesn’t increase further, which is why compensation levels off.
Most probable mechanism
When you exercise a lot, your body burns more calories, which makes your stomach send out a hunger signal and your gut send out less fullness signal. This makes you eat more without realizing it, but only up to a point — even if you exercise even more, these signals don’t get any stronger, so your eating doesn’t increase further.
Aerobic exercise creates an energy deficit by increasing total energy expenditure beyond baseline metabolic needs.
The energy deficit stimulates ghrelin-secreting cells in the stomach to increase production of acylated ghrelin, a hormone that promotes hunger.
The energy deficit reduces secretion of glucagon-like peptide-1 (GLP-1) from intestinal cells, which diminishes signals of fullness to the brain.
Elevated acylated ghrelin and reduced GLP-1 act on hypothalamic appetite centers to increase hunger perception and reduce satiety.
Increased hunger and reduced satiety lead to elevated energy intake, partially offsetting the energy deficit created by exercise.
At higher exercise volumes, the hormonal signals do not increase further, resulting in a plateau in energy intake compensation despite greater energy expenditure.
Less supported by current evidence, but not ruled out
Exercise might make food seem more rewarding to the brain, causing people to eat more without feeling hungrier — but in this case, that effect actually decreased, so it’s unlikely to be the main reason for compensation.
Aerobic exercise creates an energy deficit, which in some contexts increases the motivational value of food via dopamine-driven reward pathways.
The reinforcing value of food, measured as willingness to work for food rewards, decreased after training despite energy deficit.
This reduction contradicts the expected increase in food motivation, suggesting this pathway does not drive compensation and may reflect adaptive suppression.
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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