Dietary Changes Linked to Biological Age
A recent study published in Aging Cell indicates that adjusting carbohydrate, fat, and protein intake may influence biological age in older adults. Researchers at the University of Sydney conducted a four-week trial with 104 healthy participants aged 65 to 75.
How the Study Worked
The study divided participants into four dietary groups, varying both protein source (plant or animal) and macronutrient ratio (higher carbohydrate vs. higher fat). Total daily protein intake was kept constant at 14 percent of total energy. Researchers used a calculation called the Klemera-Doubal method to estimate biological age based on blood markers like glucose, insulin, and blood pressure.
Key Findings
Participants following a higher-carbohydrate, lower-fat omnivorous diet showed an estimated biological age roughly 3.5 to 4.1 years younger compared to those consuming a higher-fat omnivorous diet. The higher-carbohydrate diets focused on whole foods and did not include refined snacks or sugary items.
Important Considerations
Researchers emphasize that this study does not promote carbohydrates as an ‘anti-aging treatment’ nor endorse all carbohydrate-rich foods as healthy choices. However, the findings challenge the common assumption that reducing carbohydrate intake is always optimal for older adults. Further research may explore how specific nutrient balances affect aging processes.
Separate studies published in October 2026 also explored related topics: UT Southwestern researchers found links between blood proteins and social factors impacting heart health, while Queen Mary University of London scientists studied the effects of prolonged fasting on the body.
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