It’s 2025 and it seems like we still can’t reach a consensus on which diet — vegan, keto, Mediterranean — is “the best.” Experts say part of the problem is that what qualifies as “the best” or even “healthiest” depends on your personal goals.

The study found that the Alternative Healthy Eating Index (AHEI) diet was the best for healthy aging. This diet is actually a scoring system developed by Harvard nutritionists that assigns ratings to foods and nutrients to determine how likely they are to raise your risk of developing chronic disease.

Would you add a few more vegetables and whole grains to your diet in return for a healthy old age? A new study has broken down in detail the food groups that increase the likelihood of healthy aging – and identified the best diet overall.