Review Links Lower Protein Intake to Healthier Aging

A major scientific review published this week suggests that consuming less protein, or reducing intake of specific amino acids, may activate biological processes linked to healthier aging and improved metabolism, challenging the widespread assumption that more protein is always better. The analysis, published in the journal Cell Press Blue on July 31, examined findings from more than 350 studies involving animals and humans.

The review, led by metabolism researcher Dudley Lamming of the University of Wisconsin-Madison, does not argue that protein is harmful. Instead, it indicates that many people, particularly those who are sedentary, may be consuming protein well above their physiological needs, which could have unintended consequences. The general recommended daily allowance for a healthy adult is 0.8 grams of protein per kilogram of body weight, but data shows many American adults already exceed this baseline.

The science centers on how specific amino acids-methionine, leucine, isoleucine, and valine-influence cellular pathways. These nutrients activate a pathway known as mTOR, which is vital for growth and repair. However, the review suggests that chronic overactivation of...