Health⏱ 5 min read
How Much Protein Do You Need as You Get Older?
Protein requirements don't stay constant across a lifetime. Research shows older adults need significantly more protein than the official RDA — here's what the evidence says and how to hit your target.
The official UK/EU protein RDA of 0.75g per kg of body weight per day was set to prevent deficiency in sedentary adults — not to optimise health. For active people, older adults, and those trying to maintain muscle mass, the evidence points to substantially higher targets.
How Protein Needs Change With Age
Life StageRecommended IntakeRationale
Children (4-13)0.95 g/kg/dayGrowth and development
Teenagers (14-18)0.85 g/kg/dayStill growing, active
Young adults (19-30)0.75-1.6 g/kg/dayDepends heavily on activity level
Middle age (31-59)1.0-1.6 g/kg/dayMuscle preservation becomes important
Older adults (60-75)1.2-1.6 g/kg/dayAnabolic resistance increases
Elderly (75+)1.2-2.0 g/kg/daySarcopenia prevention critical
Anabolic Resistance: Why Older Adults Need More
After age 50, muscle protein synthesis (the process of building new muscle) becomes less efficient in response to both exercise and dietary protein. This is called "anabolic resistance." To achieve the same muscle-building stimulus, older adults need a higher dose of protein per meal — research suggests 35-40g per meal rather than the 20-25g effective for younger adults.
Young adult: 20g protein per meal adequately stimulates MPS
Older adult (65+): needs 35-40g per meal for the same effect
Practical implication: spreading protein across 3-4 substantial
meals matters more than it does at younger ages.
A 70kg 68-year-old at 1.4 g/kg:
Daily target: 98g protein
Per meal (3 meals): ~33g each — right in the therapeutic range
Protein and Sarcopenia Prevention
Sarcopenia — the progressive loss of muscle mass and strength with age — begins around age 30 at roughly 3-5% per decade, accelerating significantly after 60. It's a major predictor of falls, functional decline, and loss of independence.
Average muscle loss without intervention:
Age 30-40: ~3% per decade
Age 40-50: ~5% per decade
Age 50-60: ~8% per decade
Age 60+: ~10-15% per decade
Combined strategy to minimise sarcopenia:
1. Resistance training 2-3x per week
2. 1.2-1.6g/kg/day protein
3. Leucine-rich protein sources (whey, eggs, meat)
4. Adequate vitamin D (supports muscle function)
Protein Quality at Older Ages
Leucine is the amino acid that most directly triggers muscle protein synthesis. Older adults benefit from leucine-rich protein sources — animal proteins (whey, eggs, meat, fish) contain more leucine per gram than plant proteins. If following a plant-based diet, higher total protein intake compensates for lower leucine density:
Leucine per 25g protein:
Whey protein: ~2.5g leucine (excellent trigger for MPS)
Chicken breast: ~2.0g leucine
Lentils: ~0.9g leucine (lower — need more total protein)
Plant-based older adult target: 1.6-2.0 g/kg/day
to compensate for lower leucine content per gram