Tier 4 — mechanistic

A weak link in metabolism: the metabolic capacity for glycine biosynthesis does not satisfy the need for collagen synthesis

Meléndez-Hevia E, De Paz-Lugo P, Cornish-Bowden A, Cárdenas ML
Journal of biosciences 2009 34(6):853-872

Bibliography

PubMed
PMID 20093739
DOI
10.1007/s12038-009-0100-9
Funding
Funding was not specified in the indexed abstract; the full funding disclosure has not been verified.
Competing interests
The accessible abstract does not establish the authors' competing interests; absence of a statement is not evidence of no conflicts.

Study snapshot

DesignMetabolic accounting and theoretical analysis
ModelHuman metabolic-flux model; no new participant cohort
SampleLiterature-based flux estimates for a hypothetical 70 kg adult
InterventionAccounting model of glycine supply and metabolic demand; no administered intervention
DurationNot applicable; theoretical analysis
EndpointsEstimated biosynthesis; Dietary supply; Collagen-related demand

What the study showed, in plain terms

This frequently cited paper estimates a mismatch between glycine supply and demand. Its roughly 10 g/day shortfall is a model-based estimate, not a measured deficiency diagnosis or an established supplement recommendation.

Key findings

  • The calculation combines reported fluxes and assumptions about collagen turnover.
  • It proposes that glycine supply may be limiting under the modeled conditions.

What this study can and cannot tell us

Estimates depend on assumptions about production, reuse and demand.

It does not show that every adult lacks 10 g/day or that replacing that amount improves health.

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Editorial review

Reviewed by the Biohack Blueprint research team

Last verified

Dr. Khaled Mahmoud, MBBChCritical Care Medicine, Longevity Science & Editorial Direction