The Study
Effects of periodic intake of a high-caloric diet on body mass and leptin resistance.
This study watched how mice ate junk food and how their bodies responded over time. It found that eating lots of junk food made them less sensitive to a hormone that tells them to stop eating. But it didn't prove that the junk food caused this — it just showed they happened together.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
Mice that eat lots of junk food get used to it and stop responding to a fullness hormone called leptin. When they go back to healthy food, they lose weight but not all the fat — and if they’ve eaten junk food before, they get addicted to it faster.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 513 / 100
Quality 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.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — this suggests that in humans, repeated dieting may make future weight loss harder and relapse faster because the body adapts to overeating and resists returning to normal.
- 2After 11 days of junk food, leptin stopped working.
- 3After 3 days of healthy food, it worked again — unless the mice had eaten junk food for over 30 days before, then leptin stopped working again in just 3 days.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Physiology & behavior
Year
2006
Authors
M. Berriel Diaz, S. Eiden, C. Daniel, A. Steinbrück, I. Schmidt
Related Content
Claims (6)
Female C57BL/6J mice previously fed a high-calorie diet intermittently for over 30 days lose their response to the hormone leptin within three days of being fed the same diet again, while mice without that prior diet exposure do not lose leptin sensitivity as quickly.
When female C57BL/6J mice lose weight after a period of obesity, their body mass decreases but metabolic changes from prior obesity remain, even after returning to a normal diet.
Female C57BL/6J mice eat more food when it is high in calories and tasty, even when they do not need extra energy, showing that flavor alone increases their food intake.
When female C57BL/6J mice are fed a high-calorie diet for 11 days, they develop reduced sensitivity to the hormone leptin; switching them back to a standard diet for 3 days restores their sensitivity to leptin.
Female C57BL/6J mice fed a high-calorie diet alongside regular food develop leptin resistance and gain weight within two weeks, showing that diet directly alters hormonal control of energy balance.
Periodic increases in calorie intake raise leptin and thyroid hormone levels, which reduces the slowing of metabolism that occurs during long-term dieting.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.