Scientists may have uncovered a hidden biological switch that helps control how quickly the body ages. Research published in PLOS Biology suggests that declining levels of a brain protein called Menin can trigger inflammation, memory decline, and other age-related changes throughout the body. In experiments with mice, restoring the protein reversed several signs of aging, while a simple amino acid supplement improved cognitive function. The findings add to growing evidence that aging may be strongly influenced by the hypothalamus, a small but powerful brain region that regulates metabolism, hormones, body temperature, sleep, and stress responses. Researchers increasingly view the hypothalamus as a central command center for aging itself. A Brain Protein That Declines With Age The study, led by Lige Leng and colleagues at Xiamen University in China, focused on Menin, a protein that helps suppress inflammation in the brain.…