In older adults, hidden, internalized stress—not loud life chaos—tracked most strongly with faster memory decline, pointing to a new, modifiable brain‑aging lever.  

In older women, low‑dose testosterone plus exercise curbed harmful deep belly fat without big weight changes, hinting that where you store fat matters most.  

Dialing up a single hypothalamic protein and topping off D‑serine partially reversed brain aging signs, hinting at a future “control center” lever for lifespan.

Transplanting human gut microbes into mice shifted brain genes toward higher energy use and plasticity, hinting that our microbiome helped power up cognition.