Health area / Cardiometabolic health
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Evidence attached to the exact claimOpen detailed claim evidenceStatus applies to the stated population and outcome. It is not a grade for a person, ingredient, or practice as a whole.3
For generally healthy adults, 0.8 g/kg/day is the established U.S. and Canadian Recommended Dietary Allowance; Japan uses age- and sex-specific grams-per-day reference amounts.
- Outcome measured
- Meeting population-level protein requirements
- Studied population
- Generally healthy adults
- Intervention / exposure
- Meeting population protein requirements
- Compared with
- Intake below the population requirement
- Timeframe
- Average daily intake
Important limitation: The RDA is intended to cover nearly all healthy people. It is not a ceiling, a resistance-training target, or a proven optimal longevity dose.
2 primary evidence sources
- Dietary Reference Intakes: Reference TablesNational Academies via NCBI Bookshelf, 2005
- 日本人の食事摂取基準（2025年版）：たんぱく質厚生労働省, 2025
Claim reviewed: 2026-08-09Next review: 2027-02-09
For healthy older adults, 1.0–1.2 g/kg/day is a commonly proposed expert range to support muscle and function.
- Outcome measured
- Protein adequacy, muscle maintenance, and physical function
- Studied population
- Generally healthy adults aged 65 and older
Important limitation: This is geriatric expert and clinical guidance, not a universal official requirement. Illness, frailty, low energy intake, and kidney function can change the appropriate plan.
2 primary evidence sources
- ESPEN guideline on clinical nutrition and hydration in geriatricsEuropean Society for Clinical Nutrition and Metabolism, 2019
- ESPEN practical guideline: Clinical nutrition and hydration in geriatricsEuropean Society for Clinical Nutrition and Metabolism, 2022
No specific protein intake target or protein powder has been shown to extend human lifespan.
- Outcome measured
- Human lifespan
- Studied population
- No qualifying human lifespan intervention evidence
Important limitation: Evidence supports adequacy and training adaptation for particular populations and outcomes. That should not be converted into a life-extension claim.
3 primary evidence sources
- Dietary Reference Intakes: Reference TablesNational Academies via NCBI Bookshelf, 2005
- 日本人の食事摂取基準（2025年版）：たんぱく質厚生労働省, 2025
- Protein supplementation and resistance training-induced gains in muscle mass and strengthBritish Journal of Sports Medicine, 2018