Longevity & AgingWeight Loss Reverses Adipose Senescence but Leaves Immune Memory Intact
Researchers built a spatially resolved single-nucleus atlas of human adipose tissue from 70 people — lean controls, severe obesity patients before and after bariatric surgery — totaling 171,247 cells. They found that obesity drives selective cellular senescence in metabolic, precursor, and vascular cells, which weight loss potently reverses. Weight loss also reduced adipocyte hypertrophy and activated metabolic flux pathways. However, macrophage infiltration was only partially reversed: immune cells remained primed in a pro-inflammatory state even after significant weight loss, potentially predisposing patients to weight regain and persistent metabolic dysfunction. The atlas provides a comprehensive regulatory and spatial map of fat tissue remodeling in obesity and therapeutic weight loss.
