Eight Diets Associated with Slower Biological Aging, Study Finds

Biological aging measures the internal clock of an individual, unlike chronological aging, which is simply the count of years a person has lived. Dr. Saadia Hussain from the Cleveland Clinic explained that biological age reflects the condition of organs, cells, and tissues, often described as the accumulated cellular damage over time. Researchers evaluate biological age primarily through DNA analysis and health markers such as blood pressure, blood sugar, cholesterol, heart rate, height, and weight. Previous research indicates that lifestyle factors, like exercise and dietary choices, can influence the rate of biological aging.

The diets identified in the study did not rely on complex or costly ingredients but emphasized a balanced intake of nutrient-dense foods. The researchers concluded that focusing on overall nutrition is more critical than adhering to a specific diet for slower biological aging.

Among the diets studied, the DASH (Dietary Approaches to Stop Hypertension) diet showed a significant association with slower biological aging. It encourages the consumption of fruits, vegetables, whole grains, lean proteins, and nuts while limiting sugary foods and saturated fats.

The Mediterranean diet, rich in whole grains, vegetables, and healthy fats like olive oil, also supports heart health and has been linked to lower inflammation, which may contribute to improved skin health.

The Nordic diet, which promotes whole grains, fish, and limited processed foods, similarly showed consistent benefits for biological aging, differing from the Mediterranean diet mainly in its use of canola oil.

The Alternative Healthy Eating Index (AHEI) measures diet quality based on nutrient consumption, emphasizing foods that reduce chronic illness risks, such as fruits, vegetables, and whole grains.

The Planetary Health Diet includes whole foods while minimizing processed options, and although it was connected to various health benefits, it had the weakest link to biological aging in this study.

Research indicates that plant-based diets can lower hypertension risks and improve heart health, with one analysis showing that vegan diets correlate with lower cardiovascular disease risks. The Healthful Plant-Based Diet Index (hPDI) encourages consumption of nutrient-dense plant foods, differentiating it from less healthful plant options.

The MIND (Mediterranean-DASH Intervention for Neurodegenerative Delay) diet, which combines elements from both the Mediterranean and DASH diets, has been associated with reduced risks of dementia and Alzheimer's.

Conversely, the 2026 study linked two diets to quicker biological aging: an unhealthful plant-based diet that includes frequent consumption of unhealthy foods and an inflammatory diet characterized by high intake of inflammatory foods, associated with a range of chronic health conditions.