The recommended dietary allowance for protein is 0.8 grams per kilogram of body weight per day. This figure was established to prevent deficiency in sedentary young adults. It is not an adequate target for adults over 50 who want to maintain or build muscle mass. The research on protein requirements in ageing adults consistently points to a significantly higher target.
Anabolic Resistance: Why Older Adults Need More Protein Per Serving
Anabolic resistance is the reduced sensitivity of muscle protein synthesis to dietary protein that develops with age. In younger adults, a dose of 20 to 25 grams of protein maximally stimulates muscle protein synthesis. In adults over 65, the same dose produces a blunted response. Research suggests that older adults require 35 to 40 grams of protein per meal to achieve equivalent anabolic stimulation. This means that total daily intake matters but so does distribution across meals.
The Research Target for Muscle Retention After 50
- Minimum 1.2 grams per kilogram of body weight per day for sedentary adults over 50
- Optimal range of 1.6 to 2.2 grams per kilogram for adults engaged in resistance training
- At least 35 grams of protein per meal distributed across three to four meals
- Prioritise leucine-rich sources as leucine is the primary trigger for muscle protein synthesis: eggs, meat, fish, dairy, and whey protein
Common Barriers to Adequate Protein Intake Over 50
Appetite decreases with age through several mechanisms including reduced gastric emptying, altered gut hormone responses, and reduced sensitivity to hunger signals. Many older adults simply do not feel hungry enough to consume adequate protein. Practical solutions include protein-first eating at every meal, keeping protein-rich foods readily available, and using protein supplements as a practical convenience tool rather than a replacement for whole food sources.