A comprehensive review of over 350 studies, published on July 31 in Cell Press Blue, suggests that reducing protein intake could have positive effects on aging. Led by Dudley Lamming of the University of Wisconsin–Madison, the analysis found that lower protein consumption may improve metabolism, alter how cells respond to nutrients, reduce cellular damage, and help maintain healthy cell function. sciencedaily.com +2
One key mechanism identified is the rise in fibroblast growth factor 21 (FGF21) when protein intake is low. This hormone can boost energy expenditure, enhance blood sugar control, and suppress systemic inflammation. The review also highlighted specific amino acids—methionine, isoleucine, and valine—whose overconsumption may activate biological pathways linked to growth, potentially increasing risks for obesity, inflammation, and other age-related diseases. Human clinical trials have shown that lowering protein intake can lead to weight loss, reduced fat mass, and improved fasting blood sugar levels, sometimes even when total calorie intake increased. sciencedaily.com +1
However, the researchers emphasize that this does not mean everyone should cut back on protein. Active individuals, athletes, pregnant women, and frail or underweight older adults have higher protein needs for muscle maintenance, fetal development, or to prevent muscle loss.
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