nutrition · apr 2025 · 2 min read
The optimal diet for healthy ageing
key points
- A 30-year Harvard study of over 105,000 people found the Alternative Healthy Eating Index (AHEI) was the best eating pattern for ageing well.
- People who stuck closest to the AHEI were 86% more likely to be healthy at age 70 than those who stuck to it least.
- The AHEI leans on fruit, vegetables, whole grains, nuts, legumes and healthy fats, while going easy on red and processed meat, sugary drinks and salt.
- There is no single "best" diet. Every healthy pattern in the study helped, and you can adapt it to your own tastes.
- The study measured quality of life and independence in later years, not just how long people lived.
What is the best diet for healthy ageing?
A big 30-year study led by Harvard University researchers points to the Alternative Healthy Eating Index (AHEI) as the most effective eating pattern for ageing well. It came out on top when researchers compared eight different sets of healthy eating guidelines.
The study, published in Nature Medicine (2025), defined "healthy ageing" as reaching 70 without chronic disease while keeping good mental and physical health. Researchers tracked the eating habits of over 105,000 participants across three decades.
What does the AHEI diet actually involve?
The AHEI diet, which came out as the top performer, emphasises:
- Fruits and vegetables
- Whole grains
- Nuts and legumes
- Healthy fats
While limiting:
- Red and processed meats
- Sugary drinks
- Salt
Participants with the highest adherence to the AHEI were 86% more likely to be healthy at age 70 compared to those with the lowest adherence. That said, researchers noted that all of the dietary patterns they studied showed benefits for healthy ageing.
Is there a single best diet for everyone?
No, and that is reassuring. "Our findings also show that there is no one-size-fits-all diet," noted Professor Anne-Julie Tessier from the University of Montreal. "Healthy diets can be adapted to fit individual needs and preferences."
The study takes a unique approach by focusing on overall quality of life rather than just longevity or specific disease prevention. As Professor Frank Hu from Harvard explained, the research examines "how diet impacts people's ability to live independently and enjoy a good quality of life as they age."
While the Mediterranean diet has received a lot of attention in recent years, these findings suggest the AHEI may offer comparable or even better benefits for those looking to stay healthy into their later years.
Source
Dr Ahmed Al-Obaidi · FRACGP
General information only, not personal medical advice. Talk to your own GP about what suits you.