Skip to content
AlternativeMed

Protein Intake and Aging: What the Research Says

What an expert position paper, cohort meta-analyses and trials show about protein intake and protein supplements in older adults, with the limits and the kidney caution.

Content last updated . This page has not been medically reviewed.

Quick answer
Older adults may need more protein per kilogram than younger adults to keep muscle and function, according to an expert position paper. Large cohort studies link higher protein intake, especially from plants, with lower risk of death. Trials of protein supplements added to exercise show small and uncertain gains in muscle strength. None of this shows protein extends lifespan. This page is education only, not a personal protein target.

Evidence labels: established, promising but limited, mixed, insufficient evidence, expert opinion (a position paper, not a trial).

The position paper

The PROT-AGE Study Group, convened by the European Union Geriatric Medicine Society with other scientific organizations, says new evidence shows older adults need more dietary protein than younger adults to support health, recovery from illness and function, because of age-related changes in protein metabolism. It recommended an average intake of at least 1.0 to 1.2 g per kilogram of body weight per day for people over 65, more for those who are active or who have acute or chronic disease, with an exception: people with severe kidney disease (eGFR under 30) who are not on dialysis may need to limit protein. [1] These figures are one expert group's 2013 position, not individual advice, and the paper says evidence is not yet sufficient to recommend protein type or timing. [1] Label: expert opinion.

What cohort studies show

A meta-analysis of 31 prospective cohort studies (715,128 participants, 113,039 deaths, follow-up 3.5 to 32 years) found higher total protein intake was associated with lower all-cause mortality (pooled effect size 0.94, 95% CI 0.89 to 0.99). Plant protein was associated with lower all-cause mortality (0.92) and cardiovascular mortality (0.88). Total and animal protein were not significantly associated with cardiovascular or cancer mortality. An additional 3% of energy from plant protein a day was associated with a 5% lower risk of death. [2] Label: promising but limited (association). The cohorts were mostly adults, not only older adults, so this is not an older-adult finding, and food choices differ between people in ways that confound the result.

What trials show

  • Protein plus resistance training, healthy adults. A meta-analysis of 49 trials (1,863 participants) found protein supplements increased strength (about 2.5 kg on one-repetition-maximum), fat-free mass (0.30 kg) and muscle size. The effect on fat-free mass was smaller with increasing age, and intakes above about 1.6 g/kg/day gave no further gains. [3] The 1.6 g/kg/day figure is a study finding, not a target.
  • Older adults with sarcopenia or at risk. A 2026 network meta-analysis of 18 trials (1,341 people) found supplementation added to exercise improved grip strength and a muscle-mass index but not timed up-and-go, with very low certainty. [4] A 2026 meta-analysis of 7 trials (472 people) described strength training with whey protein or HMB as promising rather than definitive, citing few trials, small samples and moderate-to-high risk of bias. [5]

Label: mixed to promising but limited for muscle strength and size; insufficient evidence that protein intake changes lifespan.

Related guides

Strength training, muscle and aging and dietary patterns and healthy aging.

Frequently asked questions

Do older adults need more protein?

An expert position paper says so, and recommended intakes above those for younger adults, with a caution for severe kidney disease. It is expert opinion, not a trial result. [1]

Is plant protein linked to longer life?

In cohort studies, higher plant protein intake was associated with lower all-cause and cardiovascular mortality. This is an association. [2]

Do protein supplements build muscle in older people?

In trials combined with exercise, small gains in grip strength and muscle mass index were seen in people with or at risk of sarcopenia, but certainty is very low. [4]

Is more protein always better?

In a meta-analysis of resistance-training trials, gains in fat-free mass did not increase further above about 1.6 g/kg/day. [3]

More details: evidence, limits and cautions

The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.

Safety and who should check first
The position paper says people with severe kidney disease who are not on dialysis may need to limit protein, so anyone with kidney disease should ask a clinician before changing protein intake. [1] Supplement quality and ingredient questions are covered in the Supplements section: see amino acids and protein and protein for older adults and plant-based diets. Practical guidance is in strength training and protein for older adults.
References
  1. Bauer J et al. Evidence-based recommendations for optimal dietary protein intake in older people: a position paper from the PROT-AGE Study Group. J Am Med Dir Assoc 2013. Read 2026-10-22.
  2. Naghshi S et al. Dietary intake of total, animal, and plant proteins and risk of all cause, cardiovascular, and cancer mortality. BMJ 2020. Read 2026-10-22.
  3. Morton RW et al. Protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults: a meta-analysis. Br J Sports Med 2018. Read 2026-10-22.
  4. Comparative effectiveness of protein or protein-related supplementation combined with resistance or functional exercise for sarcopenia in older adults: a network meta-analysis. Front Nutr 2026. Read 2026-10-22.
  5. Combined effects of strength training, whey protein, and HMB on sarcopenia in older people: a systematic review and meta-analysis. Medicine (Baltimore) 2026. Read 2026-10-22.
Education, not medical advice. This page is for general information. It does not diagnose or treat any condition and is not a substitute for care from a qualified health professional. Natural does not automatically mean safe. Ask a clinician or pharmacist before changing your care, especially if you take medication, are pregnant or breastfeeding, or have a health condition.