Research
Hormonal
Testosterone deficiency reduces whole-body protein synthesis and proteolysis rates, leading to a net decrease in protein anabolism, independent of plasma amino acid concentrations.
If you have low testosterone, simply eating more protein will not fully restore muscle mass. Your body's ability to synthesize protein is directly downregulated by the lack of testosterone. Restoring hormonal balance is necessary to unlock the anabolic potential of your diet.
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Leucine’s rate of appearance (index of proteolysis) was markedly suppressed after 10 weeks of hypogonadism (−13%; P = 0.01) as well as the nonoxidative leucine disposal, an index of whole body protein synthesis (−13%; P = 0.01) without any changes in plasma amino acid concentrations.
Why this rating
High-quality isotopic tracer methods used to measure protein kinetics.
Source
Testosterone Deficiency in Young Men: Marked Alterations in Whole Body Protein Kinetics, Strength, and Adiposity<sup>1</sup>
Nelly Mauras et al. · The Journal of Clinical Endocrinology & Metabolism · 1998
DOI 10.1210/jcem.83.6.4892
crossover · n=6Cited 370×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
More from this paper
- Severe testosterone deficiency in young men causes marked decreases in whole-body protein synthesis and fat-free mass, alongside increased adiposity and decreased muscle strength, independent of changes in systemic GH or IGF-I production.Good
- Testosterone deficiency decreases lipid oxidation rates and resting energy expenditure, leading to increased adiposity, independent of changes in Growth Hormone (GH) production.Good
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