Brief
Researchers Find Fat‑Cell Memory That May Explain Weight Regain
A new study shows that obesity can leave a lasting signal in fat cells, keeping hunger high even after weight loss, and that this signal can be passed from mother to child.
By Felo News Desk · Published
Scientists at the Harrington Discovery Institute and Case Western Reserve University have identified a biological pathway that may explain why people often regain weight after losing it. The study, published in Cell Reports, shows that a hormone called asprosin, released by fat tissue, remains elevated in mice even after they return to a lean state, a phenomenon the researchers call “obesity memory.”
In experiments, brief exposure to the inflammatory molecule TGF‑β1 triggered a lasting epigenetic change in fat cells. The change kept asprosin production high for weeks after TGF‑β1 levels fell, sustaining an appetite signal that the researchers likened to a light switch that stays on. Dr. Atul Chopra, senior author, said the finding could explain why GLP‑1 drugs, which suppress appetite while taken, fail to prevent weight regain once treatment stops.
The study also found that the same asprosin signal can cross the placenta, potentially programming a baby’s fat cells before birth. Dr. Chopra noted that this may help explain why obesity can run in families and why the epidemic has persisted across generations.
While the mouse data are compelling, the researchers acknowledge that further work is needed to confirm that the same mechanism operates in humans. Publicly available human datasets support the proposed pathway, but direct evidence in people has not yet been obtained.
Key facts
- Obesity leaves a molecular memory in fat cells that keeps appetite high after weight loss (scitechdaily.com)
- The hormone asprosin is released by fat tissue and signals the brain to stimulate appetite (scitechdaily.com)
- Brief exposure to TGF‑β1 creates a lasting epigenetic change that keeps asprosin elevated (scitechdaily.com)
- The asprosin signal can cross the placenta, programming a baby’s fat cells before birth (scitechdaily.com)
Background
The study builds on earlier work linking inflammatory pathways to obesity and adds a new layer of understanding about how weight loss can be difficult to maintain.
Why it matters
If the molecular memory is confirmed in humans, it could lead to new treatments that target the underlying biological mechanism rather than only suppressing appetite during medication.
What happens next
Researchers plan to investigate whether the same pathway operates in human subjects and to explore therapeutic interventions that could reset the asprosin signal.
Sources
- [1] scitechdaily.com — originally reported as “Scientists Discover a Molecular “Memory” That Could Make Lost Weight Come Back”
