Why it's hard to keep weight off after dieting
Obesity causes selective and long-lasting desensitization of AgRP neurons to dietary fat
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
When mice eat lots of fat, their brain's 'hunger neurons' stop responding properly to signals that say 'you're full' — especially from fat. Even after they lose weight, these neurons still don't listen to fullness signals from the gut, but they do respond again to seeing or smelling food.
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
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Evidence Score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
When mice eat lots of fat, their brain's 'hunger neurons' stop responding properly to signals that say 'you're full' — especially from fat. Even after they lose weight, these neurons still don't listen to fullness signals from the gut, but they do respond again to seeing or smelling food.
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 513 / 72
Evidence Score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Publication
Authors
Beutler LR, Corpuz TV, Ahn JS, Kosar S, Song W, Chen Y, Knight ZA
Related Content
Claims (8)
Masticatory activity triggers the release of cholecystokinin and suppresses ghrelin, reducing subjective hunger independent of nutrient intake.
Obese mice don't respond as well to a gut hormone (CCK) that normally tells the brain to stop eating fat—and even after they lose weight, this blunted response doesn't come back.
In obese mice, turning on hunger neurons just before eating doesn’t make them eat much more—but turning them on while they’re eating does. This suggests their brain’s feeding system becomes less sensitive to normal hunger signals.
Obese mice eat less after fasting than lean mice—even when given their favorite food—and this isn’t just because they’re heavier; it’s linked to higher levels of the fat hormone leptin.
Obese mice don’t get as excited (in brain terms) when they see food—but when they lose weight, this brain response comes back, unlike their response to fat or hormones.