Mixed
Early-life maternal nutrient restriction (caloric or protein) programs skeletal muscle structure and metabolism, leading to reduced fiber number, altered fiber type composition, and increased susceptibility to metabolic disease and sarcopenia in later life.
Your early life environment may have set a baseline for your muscle fiber number and metabolic flexibility. While you cannot change your birth history, being aware of this 'programming' can help you prioritize metabolic health (glucose control, protein intake) to counteract potential predispositions to insulin resistance or muscle loss as you age.
It is therefore clear that as a consequence of nutrient restriction in utero, skeletal muscle demonstrates the alterations in fibre number, composition and size, which prevail into later life, despite normal feeding patterns.
Why this rating
Supported by multiple animal models (rats, sheep, pigs) and human cohort studies (Dutch Famine), though human mechanistic data is limited.
Source
Does skeletal muscle have an ‘epi’‐memory? The role of epigenetics in nutritional programming, metabolic disease, aging and exercise
Adam P. Sharples et al. · Aging Cell · 2016
DOI 10.1111/acel.12486
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- Maternal obesity or high-fat diets during gestation program offspring skeletal muscle to exhibit blunted insulin signaling, increased inflammation (TNF-alpha), and reduced myogenesis, predisposing them to insulin resistance and obesity.Good
- Epigenetic modifications (DNA methylation, histone modification) serve as the molecular mechanism for 'muscle memory,' allowing skeletal muscle to retain information from prior environmental stimuli (like exercise or stress) and respond differently upon re-encounter.Moderate
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