Eating less protein could help you live longer
Protein has become one of the most talked-about nutrients today. From protein-packed snacks and drinks to fitness advice on social media, many people are being encouraged to eat more protein. In fact, the latest U.S. dietary guidelines recommend including protein at every meal.
However, a new scientific review suggests that more protein may not always be better for health and longevity.
What Did the Study Find?
Researchers reviewed 350 studies examining protein-restricted diets in animals and humans. The findings, published in July 2026, showed that animals such as mice, rats, fish, and flies consistently lived longer and stayed healthier when they consumed less protein.
Small human studies also found potential benefits. People who followed moderate protein-restricted diets for a few weeks often:
- Lost weight and body fat
- Improved fasting blood sugar levels
- Maintained these benefits even when consuming more calories
Importantly, the human studies did not involve severe protein deprivation. Most participants still consumed protein within the recommended daily allowance (RDA).
Why Might Less Protein Be Helpful?
Scientists believe lower protein intake may encourage the body to focus more on repairing and recycling damaged cells rather than constantly creating new ones.
Cell growth and division are essential, but they can also increase the risk of errors in DNA over time. These errors may contribute to aging and diseases such as cancer. By shifting the body’s focus toward maintenance and repair, protein restriction could potentially slow some aging processes.
Researchers also found evidence that lower protein intake may increase energy-burning fat, helping the body use calories more efficiently.
Does This Mean High-Protein Diets Are Bad?
Not necessarily.
Many studies have shown that higher-protein diets can help with:
- Weight management
- Muscle maintenance
- Healthy aging
- Reduced age-related muscle loss
Some experts believe protein needs vary widely from person to person. Athletes, people who perform resistance training, pregnant women, and older adults may benefit from higher protein intake.
Plant Protein May Be the Better Choice
Research suggests that the source of protein matters.
A 2024 study found that people who consumed more plant-based protein experienced healthier aging, better physical function, and stronger cognitive health. Plant protein was also linked to a lower risk of chronic diseases.
In contrast, higher intake of animal-based protein was associated with a greater risk of certain chronic health conditions, although it may still support physical function.
Good plant-based protein sources include:
- Beans
- Lentils
- Chickpeas
- Tofu
- Nuts
- Seeds
What Do Experts Recommend Right Now?
Experts caution against drastically reducing protein intake based on current evidence. Most human studies have been relatively small and short-term, so more research is needed before firm recommendations can be made.
Scientists agree that there is no single protein target that works for everyone. Factors such as age, activity level, health status, and personal goals all influence protein needs.
For now, experts recommend focusing on overall diet quality rather than obsessing over protein numbers. Eating mostly whole foods, plenty of vegetables, fruits, legumes, and other nutrient-rich foods remains one of the most reliable strategies for long-term health.
Bottom Line
Emerging research suggests that moderate protein restriction may offer benefits for healthy aging and longevity. However, the evidence is not strong enough to recommend low-protein diets for everyone.
The best approach is to maintain a balanced diet, choose high-quality protein sources—especially plant-based options—and tailor protein intake to your individual lifestyle and health needs.
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