The Study
Mechanisms underlying regional differences in lipolysis in human adipose tissue.
This study looked at fat cells taken from people’s bellies and butts in a lab to see how they react to certain chemicals. It found that belly fat cells break down fat more easily than butt fat cells, especially in women. But it didn’t test if this causes people to gain or lose weight—it just showed what happens in a test tube.
Analysis score
Maximum 44 for a cross-sectional study.
Where the score came from
Fat cells in your belly and butt respond differently to hormones that tell fat to break down — belly cells have more 'break fat' signals and fewer 'stop breaking fat' signals.
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 540 / 100
Quality score
Snapshots of a population at a single point in time, or descriptions of small groups. Can identify correlations and prevalence, but cannot determine cause and effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1This explains why women tend to store more fat in the hips and thighs — their belly fat breaks down more easily, while butt fat resists breakdown due to stronger 'stop' signals.
- 2Belly fat cells break down fat 4-5 times more than butt fat cells; they have 2x more 'break fat' receptors, and in women, they are 40x less sensitive to 'stop fat breakdown' signals.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
The Journal of clinical investigation
Year
1989
Authors
H. Wahrenberg, F. Lönnqvist, P. Arner
Related Content
Claims (6)
In people who are not obese, fat cells around the abdomen break down fat more strongly in response to noradrenaline than fat cells in the buttocks, and this difference is larger in women than in men.
The strength with which fat cells bind to fat-burning signals is the same in belly and buttock fat, and the same in men and women. Differences in how easily fat is broken down are due to how many receptors are present, not how strongly they bind.
In nonobese adults, fat cells in the abdomen have more beta-adrenoceptors than fat cells in the buttocks, and this correlates with a much stronger fat-breaking response to noradrenaline in abdominal fat cells.
In women without obesity, fat cells around the abdomen are less responsive to signals that normally stop fat breakdown, compared to fat cells in the hips and thighs. This difference in signal sensitivity helps explain why abdominal fat breaks down more easily in women than in men, even though the number of receptors involved is the same.
Fat breakdown in response to adrenaline varies between body regions only when adrenaline directly activates its receptor; when substances that act after the receptor are used, the variation disappears, suggesting the difference is controlled at the receptor level.
Fat cells in the lower abdomen have more alpha-2 receptors than beta receptors, which makes them less responsive to signals that trigger fat breakdown.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.