Protein has become one of the most discussed nutrients in healthy eating.
It is essential for maintaining muscle and other tissues, and adequate protein becomes particularly relevant as we think about preserving physical health over the course of life.
But does that mean that more protein is always better?
The answer is more nuanced.
Higher protein intake was linked with healthy aging
Long-term research following nearly 49,000 women examined protein intake during midlife and health later in life.
Women who consumed more protein in midlife were more likely to experience healthy aging decades later — reaching older age without major chronic diseases while maintaining physical function, cognitive health and mental health.
But this finding should not be interpreted as a simple instruction to continually increase protein intake.
The study identified associations. It did not establish that eating additional protein directly causes healthier aging.
The source of protein matters
Another important finding helps explain why focusing only on quantity can be misleading.
The associations differed depending on where the protein came from.
Protein from plant foods showed particularly favorable associations with healthy aging. This suggests that the relationship may reflect not only protein itself, but also the foods and overall dietary patterns through which protein is consumed.
A portion of lentils, a handful of nuts, fish, yoghurt and processed meat can all provide protein, but they are nutritionally very different foods.
Protein quantity alone does not describe the quality of a diet.
There is no single “more is better” rule
Protein requirements are not identical for everyone.
Age, body size, physical activity, overall diet and health status can all influence individual needs.
For someone whose diet provides too little protein, increasing intake may be important. But once adequate intake is achieved, simply adding more protein should not automatically be assumed to provide additional longevity benefits.
Importantly, this research was not designed to determine an optimal number of grams of protein for healthy aging.
Focus on adequacy and quality
A more useful approach is to ask two questions:
Am I getting enough protein for my individual needs?
and
What foods are providing it?
For long-term health, protein should be viewed as one part of the overall diet rather than as an isolated target.
Healthy aging is influenced by many factors accumulated over decades. Adequate nutrition, dietary quality, physical activity and management of cardiovascular and metabolic risk all contribute to that broader picture.
The goal is therefore not to maximize protein intake.
It is to obtain an appropriate amount of protein from a balanced, high-quality diet.
