The Study
Sex-dependent effects of chronic stress on reinstatement of palatable food seeking and involvement of dopamine D1-like receptors.
This study watched rats press levers for treats after being stressed and given a special drug. It found that male and female rats reacted differently, but it didn't prove the drug or stress caused those changes—just that they happened together.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
When stressed, male rats start craving junk food again because their brain's dopamine system gets overactive, but female rats don't — their brains use a different system that actually makes them less likely to crave it.
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 517 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — this suggests human men and women may relapse to unhealthy eating under stress in completely different ways, meaning treatments must be tailored by sex.
- 2Male rats: stress + no drug → 40% more food-seeking after pellets; with SCH-23390 → no increase.
- 3Female rats: stress → 30% less food-seeking after cues; SCH-23390 made them press levers more overall, even without stress.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Behavioural brain research
Year
2020
Authors
Kevin T. Ball, Brandon J. Arnsberger, R. McDonald
Related Content
Claims (4)
Eating highly palatable foods triggers a brain reward system involving dopamine, and this system becomes active when a person experiences stress or negative emotions.
In male rats previously trained to seek high-calorie food, repeated stress increases their motivation to seek food again after a cue, and daily injection of SCH-23390 blocks this effect.
In female rats previously trained to seek palatable food, prolonged stress reduces their tendency to resume food-seeking when exposed to cues associated with food, and this reduction occurs independently of dopamine D1 receptor activity.
In female rats, blocking dopamine D1-like receptors with SCH-23390 increases the rate of lever pressing during extinction and cue-induced reinstatement, regardless of stress exposure.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.