There is no single food that guarantees a longer life.
But when researchers look across large populations, some food groups appear remarkably consistently in diets associated with lower mortality.
The clearest examples are:
nuts
whole grains
fruits
vegetables
fish
A large umbrella review published in 2025 brought together evidence from systematic reviews and meta-analyses examining major food groups and all-cause mortality.
These five food groups showed associations with lower mortality both when people with higher and lower intakes were compared and when researchers examined changes in risk as consumption increased.
What is particularly interesting is that these foods do not belong to one specific diet.
They appear in different combinations across Mediterranean, Nordic, Japanese and other healthy dietary patterns.
They also provide different nutrients.
Nuts provide unsaturated fats, plant protein, fiber and numerous bioactive compounds. Whole grains provide fiber and retain more of the original grain structure and nutrients than refined grains. Fruits and vegetables provide fiber, vitamins, minerals and a wide range of plant compounds. Fish can provide protein and, depending on the type, long-chain omega-3 fatty acids.
This helps explain why there may be more than one way to eat for healthy aging.
The common ground between healthy diets may be more important than the name of the diet itself.
It is also important to remember what this evidence can — and cannot — tell us.
These findings come predominantly from long-term observational research. They show that certain food groups repeatedly occur in dietary patterns associated with lower mortality. They do not prove that any individual food will extend a person’s life.
The more useful message is the consistency of the overall pattern.
Different cuisines can look very different on the plate while still sharing many of the same foods associated with long-term health.
