The way we eat at 35 might not be quite right for us at 75. While healthy eating habits matter throughout life, new research suggests that our nutritional priorities may need to shift as we get older, particularly when it comes to protein.
A review published in The Innovation Nutrition examined findings from more than 30 large population studies and analyses, along with other research on diet and aging. The researchers found that food quality, nutrient balance and age may all play important roles in long-term health. Their findings also challenge the idea that eating less is necessarily the key to living longer.
For decades, scientists have studied whether restricting calories can extend lifespan. Experiments have shown promising results in animals, but there's much less certainty about the long-term benefits for humans. Eating too little can also come with risks, including inadequate nutrition and loss of muscle and bone.
Instead, the researchers suggest that choosing the right kinds of foods may offer a more practical approach to healthy aging.
One of the most interesting findings involves protein. During middle age, studies have generally linked eating more plant-based protein, particularly in place of red and processed meat, with a lower risk of premature death.
But as people enter their 60s and beyond, getting enough protein becomes especially important. Muscle naturally declines with age, making it harder to maintain strength, balance and independence. Protein-rich foods such as fish, beans, eggs, dairy products and lean meats can help support muscle health.
That doesn't mean people should suddenly change how much protein they eat when they turn 65. Rather, the findings highlight why nutritional needs aren't necessarily the same throughout adulthood.
The researchers also found that the quality of carbohydrates matters more than simply cutting them out. Across several large studies, people who ate moderate amounts of carbohydrates tended to have lower mortality rates than those at either extreme. But where those carbohydrates came from was important.
Whole grains, beans, vegetables and fruits were generally linked to better health outcomes than refined grains and sugary drinks. Fiber stood out, too, with higher intake consistently associated with a lower risk of premature death.
A similar pattern emerged with dietary fats. Rather than avoiding fat altogether, the evidence favored foods containing unsaturated fats, such as nuts, olive oil and fish.
These findings aren't necessarily surprising. They largely reinforce familiar advice about eating a varied diet built around nutritious foods. What's different is the growing recognition that the balance of those foods may need to change as we age.
The review also explored whether future dietary recommendations could become more personalized. Scientists are studying why two people can eat the same meal but have different blood sugar responses, and whether factors such as gut bacteria, genetics and meal timing could help explain those differences.
It's an intriguing possibility, but researchers haven't yet shown that diets tailored using these measurements help people live longer.
There are other important limitations. Much of the evidence comes from studies that follow people's eating habits and health over time. These studies can identify connections, but they can't prove that a particular diet causes someone to live longer. The authors also proposed specific dietary targets for different age groups, but those recommendations haven't been tested as a complete eating plan.
For now, the strongest evidence continues to support many of the same habits nutrition experts have recommended for years: eating plenty of vegetables, fruits, whole grains and beans, choosing healthier fats and getting enough protein.
The difference may be in how we put those pieces together as we get older. Rather than searching for a single diet that promises a longer life, the research suggests that healthy eating may be something we continue to adjust throughout our lives.
The review was supported by the National Key Research and Development Program of China and the National Natural Science Foundation of China.