Gut microbes can signal fat tissue to burn energy. In mice fed a low‑protein diet, specific bacteria triggered conversion of white fat into energy‑burning beige fat—but only when those microbes were present.

Health-related anxiety about aging was linked to faster biological aging. Women who reported greater worry about physical decline showed accelerated epigenetic age based on DNA methylation markers.

Common environmental chemicals were linked to faster biological aging. Environmental load may be part of the longevity equation. 

Exercise intensity shapes the gut. High training loads caused measurable shifts in bacterial species and short-chain fatty acids, while lighter training led to different microbial profiles.