Protein Intake for Aging Adults: 2026 Guidelines for Preserving Muscle Mass
By Dr. Sarah Mitchell, Respiratory Equipment Specialist · Published 2026-02-25 · 8 min read
New research shows older adults need 1.2-1.6g protein per kg body weight to prevent sarcopenia. Here is how to hit it.
Why Protein Matters More With Age
After age 50, adults lose 1-2% of muscle mass annually without intervention. This sarcopenia drives falls, frailty, and respiratory weakness — accessory breathing muscles atrophy too.
Updated Recommendations
The RDA of 0.8 g/kg is now widely considered inadequate for older adults. Current geriatric guidelines recommend:
- Healthy older adults: 1.0-1.2 g/kg/day
- Active or recovering: 1.2-1.6 g/kg/day
- Acute illness: Up to 2.0 g/kg/day
For a 160-lb (73 kg) adult, that means 88-117g protein daily.
The Leucine Threshold
Each meal should contain 2.5-3g leucine to maximally trigger muscle protein synthesis — roughly 30-40g high-quality protein per meal.
Best Sources
- Whey isolate (24g protein, 2.7g leucine per scoop)
- Eggs (6g protein, 0.5g leucine each)
- Greek yogurt (17g protein per cup)
- Salmon (25g protein per 4 oz)
- Lean beef, chicken, tofu, lentils