Nutritional genomics: defining the dietary requirement and effects of choline.
Level 5 - mechanism / opinion, no new human data
Narrative review describing nutrigenomic mechanisms without new primary clinical trial data.
PubMed 21270363 · doi:10.3945/jn.110.130369
What was done
This narrative review summarizes clinical nutrigenomic concepts and prior metabolic feeding studies evaluating how single nucleotide polymorphisms (SNPs) in genes related to choline and folate pathways alter human dietary choline requirements and deficiency-induced organ dysfunction.
What was found
The abstract reports no numerical data, confidence intervals, or precise sample sizes. It summarizes that most men and postmenopausal women develop muscle or liver dysfunction during choline deprivation, while more than half of premenopausal women are resistant due to estrogen-driven upregulation of phosphatidylethanolamine-N-methyltransferase (PEMT). Premenopausal women carrying a specific PEMT SNP do not benefit from this estrogen induction and require dietary choline. Furthermore, individuals with SNPs in MTHFD1 have higher choline requirements to support homocysteine methylation and are more susceptible to organ dysfunction when dietary choline is restricted.
Why it matters
It illustrates how individual genetic variation and hormonal status interact to modulate essential nutrient requirements, providing a mechanistic basis for personalized dietary recommendations.
Limits
The abstract contains no primary data, effect sizes, or participant numbers, functioning solely as a narrative overview. Findings on fetal brain development rely on rodent models rather than human clinical outcomes, and the clinical impact of these SNPs across diverse populations is not quantified.
Cited by
- supports Individual metabolic enzymes vary such that individual vitamin requirements can differ substantially from average recommended dietary guidelines.