Protein provides the essential amino acid building blocks for cellular repair, enzyme production, and crucially, muscle protein synthesis. Adequate intake is fundamental for combating age-related muscle loss (sarcopenia), supporting immune function, and maintaining metabolic health, though its role in modulating the mTOR pathway presents a complex trade-off for longevity.
Verdict
Essential for muscle health; prioritize sufficient intake, especially with age.
HEALTHSPAN IMPACT
Foundational
RISK LEVEL
Very Low
EVIDENCE GRADE
A
MONTHLY COST
$30 - $150
Protocol
- Consume 1.2-1.6 grams of protein per kilogram of body weight daily to combat sarcopenia.
- Distribute protein intake evenly across 3-4 meals to maximize muscle protein synthesis.
- Prioritize high-quality, complete protein sources rich in essential amino acids like leucine.
Flags
- Excessive intake may strain kidneys in individuals with pre-existing renal disease.
- High protein intake, particularly from animal sources, can activate mTOR, a pathway linked to accelerated aging.
- Leucine content is a key driver of muscle protein synthesis but also a potent mTOR activator.
- Protein source quality (complete vs. incomplete amino acid profiles) significantly impacts efficacy.