Four-Week Diet Shift Shows Early Signs of Reversing Biological Aging

A four-week randomized trial in adults aged 65–75 tested four diets with different protein sources and fat–carbohydrate mixes. The omnivorous high-fat diet (OHF) had little impact on aging biomarkers, while three other diets—omnivorous high-carb (OHC) and two semi-vegetarian regimens (VHF, VHC)—reduced estimated biological age as measured by the Klemera-Doubal Method across 20 biomarkers (e.g., blood pressure, insulin, cholesterol, CRP). Findings are preliminary, with not all changes statistically significant, and longer-term studies are needed to determine durability and potential effects on age-related disease risk.