A University of Sydney study published in Aging Cell found that adults aged 65–75 who followed specific diets for four weeks showed measurable reductions in biological age. Participants who cut dietary fat or shifted toward plant-based protein saw improvements in biomarkers like cholesterol, insulin, and C-reactive protein. The most striking results came from a low-fat, high-carbohydrate omnivorous diet. Those who continued eating closest to their usual high-fat diet saw no meaningful change. While the findings are early-stage and require larger trials to confirm long-term disease risk reduction, they suggest that meaningful biological changes linked to aging can occur rapidly in response to dietary shifts — even later in life.
