Eating Less Protein Linked to Healthy Ageing in Review

A review published in Cell Press Blue on 31 July 2026 has reignited debate over how much protein adults actually need. Dudley Lamming and Bailey Knopf of the University of Wisconsin-Madison analysed more than 350 studies on protein and amino acid restriction, concluding that cutting back on protein, and specifically on three amino acids, methionine, isoleucine and valine, reproduces many of the metabolic benefits seen in longer-lived laboratory animals. In rodent studies, reducing dietary protein from around 20 percent of calories to 5 to 10 percent increased maximum lifespan by more than 20 percent, according to the review. The authors reported that lower protein supplements raises a hormone called FGF21, which is linked to higher energy expenditure and better blood sugar control. Human trials cited in the review showed protein restriction reduced weight and fat mass and improved fasting glucose, but the authors were explicit that this does not show the same effect extends human lifespan.

What the human evidence actually shows

Reported by Medical Xpress, the review's corresponding author Dudley Lamming cautioned that most people in the UK and US already eat more protein than they need because they are relatively sedentary, while athletes tolerate much higher intakes without the same metabolic risks he described. The review found short-term human trials linked protein restriction to improved blood sugar and reduced fat mass, but its authors stated there is no direct evidence it extends human lifespan. Vulnerable groups, including older adults, pregnant women and people managing certain health conditions, may need higher protein intakes, the review noted, rather than less.

What this means for your supplement routine

This is animal and mechanistic research, not a recommendation to change how much protein anyone eats, and Perqen is not suggesting otherwise. What it does show is that the debate around protein has moved beyond simply how much to also include which amino acids and when, which is worth knowing before comparing it against the full range of products already in a typical UK supplement cupboard.

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This article reports published news and research and is for information only. Food supplements are not a substitute for a varied diet or medical care, and no product mentioned is intended to diagnose, treat, cure or prevent any disease. Speak to your GP or pharmacist before changing what you take, especially if you are pregnant, breastfeeding, or taking prescribed medicines.

Sources

• Reducing protein intake could support healthy aging by reshaping metabolism
• Can Eating Less Protein Help You Live Longer? Studies Offer Clues

Originally reported by Medical Xpress. This article has been reviewed by Dr Tosin.