Obesity Imprints Long-Lasting Epigenetic Memory in Immune Cells, Study Finds
Researchers discovered that obesity leaves DNA methylation marks on helper T cells that can persist for five to ten years after weight loss, potentially sustaining disease risk.
A ten-year investigation headed by Professor Claudio Mauro at the University of Birmingham reports that obesity creates durable DNA methylation patterns in CD4+ T lymphocytes, forming a molecular "memory" that can endure for five to ten years after weight reduction. Analysis of blood and tissue from diverse groups—including obese individuals receiving weight-loss injections, patients with Alström syndrome, participants in a 10-week exercise program, and osteoarthritis surgery patients—revealed altered epigenetic marks affecting autophagy and immune senescence pathways.
Parallel mouse studies supported the human findings. The persistence of these changes may help explain why former obese persons retain elevated risk for conditions like type-2 diabetes and certain cancers despite normal body weight. Researchers propose that prolonged weight-maintenance or repurposed therapies such as SGLT2 inhibitors might accelerate the reversal of this immune imprint. Senior author Belinda Nedjai emphasized the broader implications for long-term disease risk, while Andy Hogan highlighted challenges in managing obesity’s relapsing nature.
Why it matters
It explains why health risks can remain after weight loss and points to new therapeutic approaches.
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