Key Takeaways
- Studies show that restricting protein intake can increase lifespan in rodents.
- Protein restriction boosts the hormone FGF21, which improves blood sugar levels and reduces senescent cells.
- High protein intake may be harmful for sedentary individuals but is fine for those who exercise regularly.
A new study suggests that restricting dietary protein could potentially extend lifespan. The research, conducted by Dudley Lamming at the University of Wisconsin-Madison and his colleagues, analyzed over 300 studies focusing on how reducing protein intake to minimal levels affects ageing and longevity in rodents.
In these studies, rodents were given either the minimum recommended protein intake or about double that amount. Rats consuming around the minimum protein lived nearly 120 days longer than those eating twice as much protein.
The key mechanism behind this effect is the hormone FGF21, which increases in response to protein restriction. This hormone acts on the brain, fat tissue, and liver to improve blood sugar levels and reduce senescent cells—aging cells that accumulate with time and cause chronic inflammation.
Additionally, restricting protein intake dampens the activity of mTORC1, a protein that stimulates cell growth. Reducing its activity enhances cellular repair processes, leading to slower aging and potentially extended lifespan in mice.
While these findings are promising, it is important to note that rodents differ significantly from humans when it comes to protein metabolism. Lamming emphasizes that the recent trend of increasing protein intake may be beneficial for individuals who exercise regularly, as they require more protein to repair muscle damage. However, excessive protein consumption could be harmful for sedentary people.
Donald Layman at the University of Illinois Urbana-Champaign points out that rodents vary greatly in their response to feeding and protein metabolism, highlighting the need for further research before making definitive conclusions about human health.
The implications of this study extend beyond just dietary habits. It challenges the current wellness trend of high-protein diets and suggests a more nuanced approach to nutrition as we age.
We have this impression that dietary protein is sort of a universally good thing.
Dudley Lamming, University of Wisconsin-Madison
Increasing dietary protein, beyond what’s needed, for sedentary individuals or animals leads to metabolic problems and can lead to shorter lifespan as well.
Dudley Lamming, University of Wisconsin-Madison
