Obese adults who lose weight through lifestyle changes tend to rely more on deliberate mental strategies to control eating, such as strict dieting or flexible planning, while those who undergo...
Mechanism
Synthesis from 1 study
After losing weight by dieting, your body still feels hungry because it thinks you're starving, so you have to think hard to resist eating — this is shown in 10.1371/journal.pone.0346240. After weight loss surgery, your gut releases hormones that naturally make you feel full and less tempted by...
Most probable mechanism
After weight loss through dieting, the body still signals hunger because fat stores are lower, so people learn to consciously control what and how much they eat by thinking hard about food choices, as shown in 10.1371/journal.pone.0346240. After weight loss surgery, the gut releases more satiety hormones that automatically reduce hunger and make food less tempting, so people don’t need to think as hard about controlling their eating, also shown in 10.1371/journal.pone.0346240.
Calorie restriction during lifestyle-induced weight loss reduces adipose tissue mass, leading to decreased leptin and increased ghrelin secretion, which activates hypothalamic NPY/AgRP neurons and increases subjective hunger and food motivation — supported by 10.1371/journal.pone.0346240.
Persistent hunger signals enhance the salience of food cues via activation of the mesolimbic dopamine pathway, increasing cravings and the motivational drive to eat — supported by 10.1371/journal.pone.0346240.
Repeated cognitive effort to restrict food intake strengthens prefrontal cortical inhibition over limbic reward responses, leading to increased habitual use of rigid and flexible dietary restraint — supported by 10.1371/journal.pone.0346240.
Bariatric surgery alters gastrointestinal anatomy, accelerating nutrient delivery to the distal ileum and triggering increased secretion of GLP-1, PYY, and CCK from L-cells — supported by 10.1371/journal.pone.0346240.
Elevated gut hormones bind to receptors in the hypothalamus and nucleus tractus solitarius, suppressing orexigenic neurons and reducing hunger perception, while simultaneously diminishing activity in reward circuits (striatum, orbitofrontal cortex) in response to food cues — supported by 10.1371/journal.pone.0346240.
The combined effect of reduced hunger and diminished food reward leads to automatic suppression of eating behavior without requiring increased cognitive restraint — supported by 10.1371/journal.pone.0346240.
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.