Stories
Why Weight Creeps Back: The Science of Obesity Memory
- •New scientific research reveals that fat cells and immune cells retain a biological memory of past obesity, driven by lasting chemical changes.
- •A study published in Cell Reports highlights the role of asprosin, a hunger-promoting hormone that remains elevated even after weight loss.
- •Experts emphasize that weight regain is often a result of biological factors rather than a lack of personal willpower or discipline.
- •Epigenetic tags on genes inside fat cells make them absorb nutrients faster and trigger rapid weight gain.
- •Researchers hope understanding this cellular memory will lead to better treatments and therapies to prevent weight rebound.
Key Questions Answered
Obesity memory refers to lasting chemical changes or molecular tags left on genes inside fat cells after weight loss, preventing them from returning to a healthy state and making them extra sensitive to insulin and nutrient absorption. Additionally, fat cells continue producing elevated levels of hunger-promoting hormones like asprosin, which push the body to feel hungry and rapidly regain weight.
Asprosin is a hormone released by fat tissue that signals the brain to trigger hunger. A study published in Cell Reports found that even after weight loss, asprosin levels remained elevated in mice, causing them to feel hungrier and eat more. The inflammatory-signalling molecule TGF-beta1 drives this process, and neutralizing asprosin has been shown to prevent excess weight regain in animal studies.
Yes, research indicates that this metabolic legacy may pass to the next generation. The study showed that offspring of obese mice exhibited higher asprosin levels and gained more weight when placed on a high-fat diet, though blocking the pathway successfully reduced this susceptibility.
