In this article
The Protein Paradox
Protein generates genuine scientific debate in longevity circles: adequate protein is essential for muscle mass, bone density, and immune function, but protein activates mTOR, which when chronically elevated may accelerate aging.
Anabolic Resistance After 40
Skeletal muscle cells become less responsive to the anabolic signal from protein intake. Older adults need more protein per meal to achieve the same muscle-building effect.
The Leucine Threshold
Adults over 40 need 2.5-3.0 grams of leucine per meal (about 30-45 grams of protein). Leucine acts as the ignition key for muscle protein synthesis.
The mTOR Debate
mTORC1 promotes growth but suppresses autophagy. However, after 40, the consequences of sarcopenia are a far greater and more immediate threat than theoretical mTOR-driven aging.
The Practical Resolution
Daily total: 1.2-1.6 g/kg body weight. Distribute across 2-3 meals crossing the leucine threshold. Front-load protein toward earlier meals. Incorporate periodic fasting for autophagy.
The Indian Diet Challenge
Average protein intake in India is 0.6-0.8 g/kg — below even the conservative RDA. Practical adjustments: add paneer, eggs, whey protein, and increase dal portions.
At Genoryx, we assess body composition via DEXA scan and design personalised nutrition protocols. Book a consultation and protect the muscle mass that determines your quality of life after 40.
Sources
Studies named in this article that we matched to the original paper. A study described without enough detail to identify it is not listed.
- 01Moore DR, Churchward-Venne TA, Witard O, et al. Protein ingestion to stimulate myofibrillar protein synthesis requires greater relative protein intakes in healthy older versus younger men. Journals of Gerontology: Series A. 2015. doi:10.1093/gerona/glu103 (opens in a new tab)
This article is for education. It is not a diagnosis or a treatment plan; decisions about tests, medicines or supplements belong in a consultation with a physician who knows your history.
About the author
Dr. R. Brahmananda Reddy
MSc Dermatology, University of Hertfordshire (UK) · Founder & Chief Longevity Physician
MBBS · MSc Dermatology (University of Hertfordshire, UK) · Fellowship in Aesthetic & Regenerative Medicine (University of Greifswald, Germany). 13+ years in clinical practice.
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