Certain foods and dietary patterns may affect how genes are regulated without changing the DNA sequence, which in turn can influence metabolism and bodily functions.
Mechanism
Synthesis from 3 studies
What you eat changes how your genes are read by adding or removing chemical tags on DNA and its packaging proteins. These changes help your cells burn fat for energy, make more power, and stop harmful inflammation, leading to better overall metabolism and gut health.
Most probable mechanism
When you eat certain foods, your body uses nutrients from them to change how your genes are turned on or off without changing the DNA itself. These changes help your cells burn fat more efficiently, produce more energy, and reduce harmful inflammation. This happens because the nutrients adjust chemical tags on DNA and its surrounding proteins, making it easier for beneficial genes to be read and harder for harmful ones to be activated.
Dietary intake of methyl-donor nutrients (e.g., folate, vitamin B12) and energy-restricted conditions alter the availability of S-adenosylmethionine, the primary methyl donor for DNA and histone methylation reactions.
Changes in S-adenosylmethionine levels drive site-specific DNA methylation at promoters and enhancers of metabolic and inflammatory genes, either activating lipid oxidation and mitochondrial function genes or silencing pro-inflammatory genes.
Nutrient-sensitive signaling pathways (e.g., AMPK, SIRT1) are activated under low-energy conditions, increasing NAD+ levels and enhancing histone deacetylase activity, which removes acetyl groups from histones at inflammatory gene loci.
Diet-derived molecules (e.g., phytic acid) directly bind to and activate histone deacetylase enzymes (e.g., HDAC3), promoting deacetylation of histone marks at promoters of genes that degrade tissue barriers.
Histone deacetylation and DNA methylation converge to create a chromatin state that favors transcription of genes involved in mitochondrial fatty acid oxidation, TCA cycle activity, and epithelial barrier integrity, while repressing genes that drive inflammation and tissue breakdown.
Enhanced mitochondrial metabolism increases energy production and reduces accumulation of lipid intermediates, while strengthened epithelial barriers prevent leakage of inflammatory molecules into circulation, collectively improving metabolic homeostasis.
Less supported by current evidence, but not ruled out
Certain foods can change the levels of small RNA molecules that control how much of specific proteins are made, helping cells adjust their metabolism and reduce inflammation without altering DNA.
Nutrient availability influences the expression of specific microRNAs that target mRNAs involved in lipid metabolism, mitochondrial function, and adipocyte differentiation.
Downregulation of microRNAs that inhibit lipid oxidation (e.g., miR-27a, miR-34a) and upregulation of microRNAs that promote mitochondrial activity (e.g., miR-193b) enhance fat burning and energy efficiency.
Altered microRNA profiles lead to increased expression of genes for fatty acid transport, mitochondrial biogenesis, and insulin signaling, improving metabolic flexibility.
Evidence from Studies
Supporting (3)
Community contributions welcome
Vitamin B12 Regulates the Transcriptional, Metabolic, and Epigenetic Programing in Human Ileal Epithelial Cells
Phytic acid (InsP6) activates HDAC3 epigenetic axis to maintain intestinal barrier function
Contradicting (0)
Community contributions welcome
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