When obese individuals lose weight, their bodies burn fewer calories at rest than expected, and this reduction is linked to higher hunger levels, even after accounting for how much weight they lost....
Mechanism
Synthesis from 1 study
When people with obesity lose weight by eating less, their bodies slow down calorie burning more than expected and release more hunger signals while reducing fullness signals, making them feel hungrier — this happens regardless of how much weight they lose, and when they stop losing weight, both...
Most probable mechanism
When someone with obesity eats less to lose weight, their body slows down calorie burning more than expected, and at the same time, hunger hormones go up while fullness hormones go down, making them feel hungrier — this happens whether they lose a lot or a little weight, and when they stop losing weight, both the slow metabolism and hunger return to normal (10.1016/j.ajcnut.2023.10.010).
Caloric restriction during active weight loss creates a sustained energy deficit, triggering a homeostatic response to conserve energy (10.1016/j.ajcnut.2023.10.010).
This energy deficit causes a disproportionate reduction in resting metabolic rate (RMR) beyond what is predicted by loss of body mass, indicating metabolic adaptation (10.1016/j.ajcnut.2023.10.010).
Metabolic adaptation is accompanied by increased plasma ghrelin (a hunger-promoting hormone) and decreased plasma PYY and GLP-1 (satiety-promoting hormones), directly linking reduced energy expenditure to altered gut-brain signaling (10.1016/j.ajcnut.2023.10.010).
These hormonal changes act on hypothalamic appetite centers to increase subjective hunger and desire to eat, independent of the amount of weight lost (10.1016/j.ajcnut.2023.10.010).
During weight stabilization, energy deficit is resolved, leading to normalization of resting metabolic rate and restoration of gut hormone levels to pre-weight-loss baselines, which coincides with the return of appetite ratings to baseline (10.1016/j.ajcnut.2023.10.010).
Evidence from Studies
Supporting (1)
Community contributions welcome
Contradicting (0)
Community contributions welcome
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.