With age, the species and metabolic networks in the gut that make these signals dwindle. Eating well is the floor, and nobody should skip fiber, protein and plants. But a perfect diet feeds only the bacteria that are still there.
Guards the brain
Gut signals help guard the blood–brain barrier and calm the brain's immune cells.
Loh 2024, Signal Transduct Target Ther · Ji 2025, Biomol Biomed