Here's another reason to love low-carb, ketogenic-style diets: they might help protect the brain from aging. New research shows that ketone bodies—specifically beta-hydroxybutyrate (BHB)—activate cellular pathways that reduce inflammation, improve mitochondrial efficiency, and even enhance DNA repair in brain cells. In animal models, these effects translated to preserved cognitive function and less neurodegeneration with age. It makes sense from an evolutionary perspective: during fasting or carb restriction, the body switches to ketones as a more efficient fuel, especially for the brain. This "metabolic switch" seems to activate longevity pathways that may be dormant on a standard Western diet. While a strict keto diet isn't right for everyone, incorporating strategic fasting or carb cycling could offer some of these benefits without going full keto.