What Is Nutrigenomics?

Nutrigenomics is the study of how your genes affect the way your body processes nutrients — vitamins, minerals, fatty acids, and other dietary compounds. Just as pharmacogenomics explains why the same medication works differently in different people, nutrigenomics explains why the same diet does not produce the same results for everyone.

This article covers what nutrigenomics is, which genes are most relevant, what a nutrigenomics report can tell you, and how consumer DNA data from services like 23andMe and AncestryDNA can be used for nutrigenomic analysis.

How Genes Affect Nutrient Metabolism

Your body uses enzymes and transport proteins — encoded by your genes — to absorb, convert, transport, and use the nutrients from food. Genetic variants in these genes can alter how efficiently these processes work.

For example, a variant in the MTHFR gene can reduce your body's ability to convert folic acid into its active form, methylfolate. A variant in the VDR gene may affect how your body uses vitamin D. A variant in BCMO1 may reduce how efficiently you convert beta-carotene from plant foods into usable vitamin A.

These are not diseases or deficiencies. They are normal genetic variations that exist across the population. But understanding them can help contextualize dietary choices — particularly when it comes to nutrient forms, food sources, and whether supplementation might be worth discussing with your healthcare provider.

Key Genes in Nutrigenomics

Several genes have well-studied nutrigenomic associations. DecodeMyBio's Nutrition & Methylation Report focuses on genes with the strongest evidence base:

• MTHFR — Encodes the enzyme methylenetetrahydrofolate reductase, which converts dietary folate into its active form (5-MTHF). The C677T variant (rs1801133) is the most studied nutrigenomic variant in the world. Homozygous TT individuals may have up to 70% reduced enzyme activity. This affects folate metabolism, homocysteine levels, and methylation processes. See our dedicated guide on MTHFR C677T: what it means and what to do.
• FUT2 — Encodes fucosyltransferase 2, which affects vitamin B12 absorption in the gut. Non-secretor variants (about 20% of the population) are associated with lower B12 levels. This does not mean deficiency, but may be relevant context for people with borderline B12 status.
• VDR — The vitamin D receptor gene. Variants can affect how your body responds to vitamin D. Some variants are associated with lower circulating vitamin D levels in population studies, though the clinical significance for individuals is complex and context-dependent.
• COMT — The catechol-O-methyltransferase gene. The Val158Met variant affects how your body processes catechol compounds and may influence methylation demand, with potential implications for B-vitamin utilization.
• TCN2 — Encodes transcobalamin II, the protein responsible for transporting vitamin B12 into cells. Variants can affect B12 delivery efficiency, complementing FUT2 absorption data.
• BCMO1 — Encodes beta-carotene monooxygenase 1, the enzyme that converts beta-carotene (from carrots, sweet potatoes, and other orange vegetables) into retinol (active vitamin A). Some variants reduce this conversion by up to 50%, meaning dietary beta-carotene may be a less reliable source of vitamin A for affected individuals.

What a Nutrigenomics Report Tells You — and What It Does Not

A well-designed nutrigenomics report provides context for understanding your nutrient metabolism. It is not a diagnostic tool, a substitute for blood work, or a personalized diet plan.

What a nutrigenomics report can tell you:

• Which nutrient pathways may be affected by your genetic variants
• Whether certain nutrient forms (e.g., methylfolate vs. folic acid) may be more relevant for your genotype
• Which dietary areas may warrant additional attention or discussion with your healthcare provider
• How your genetic profile compares to population-level research findings

What a nutrigenomics report cannot tell you:

• Whether you are currently deficient in any nutrient — that requires blood work
• Exactly how much of any nutrient you need — requirements depend on many non-genetic factors
• What diet is “best” for you — nutrition is far too complex for a single genetic test to answer
• Whether you need supplements — supplementation decisions should involve your healthcare provider and ideally lab testing

Nutrigenomics provides one layer of information. Combined with lab work, dietary history, and clinical context, it can help personalize nutritional guidance — but it does not replace any of those other inputs.

Nutrigenomics and Consumer DNA Data

Consumer genotyping arrays from 23andMe, AncestryDNA, and similar services include many of the SNPs relevant to nutrigenomics. Your raw data file likely contains the key variants for MTHFR, FUT2, VDR, BCMO1, and other nutrigenomic genes — the information simply needs to be extracted and interpreted.

This is the same principle as pharmacogenomic analysis from raw DNA data — your raw data contains far more information than what the consumer service reports on. A dedicated analysis extracts the nutrigenomic variants and maps them to the research literature.

DecodeMyBio's Nutrition & Methylation Report analyzes these variants from your existing consumer DNA data. The report includes a priority dashboard, genotype-specific context for each nutrient pathway, and a tiered action plan organized by evidence strength. You can view a sample report to see the format and depth of analysis before uploading.

The Relationship Between Nutrigenomics and Pharmacogenomics

Nutrigenomics and pharmacogenomics are related fields that both study how genetics affect the way your body processes substances — nutrients in one case, medications in the other. Some genes are even relevant to both: MTHFR, for example, affects folate metabolism (a nutrigenomic concern) and may influence methotrexate response (a pharmacogenomic concern).

If you have already explored pharmacogenomics through DecodeMyBio, a nutrigenomics report uses the same raw data file. No additional test is needed — the analysis simply focuses on a different set of genes and a different domain of health.

Limitations and Important Context

Nutrigenomics is a relatively young field compared to pharmacogenomics. While pharmacogenomics benefits from decades of clinical trials and established guidelines (like CPIC), many nutrigenomic associations are based on population-level observational studies rather than randomized controlled trials.

This means nutrigenomic results should be interpreted with appropriate caution. The evidence for MTHFR C677T and folate metabolism is strong and well-replicated. For some other genes, the research is promising but still evolving. DecodeMyBio rates the evidence strength for each finding and clearly distinguishes between well-established and emerging associations. See our methodology and limitations pages for details on how we evaluate and present evidence.

Frequently Asked Questions

What is nutrigenomics?

Nutrigenomics is the study of how genetic variations affect the way your body metabolizes nutrients. It examines genes involved in folate processing, vitamin absorption, fatty acid conversion, and other nutritional pathways to provide personalized context for dietary decisions.

Can a nutrigenomics test tell me exactly what to eat?

No. Nutrigenomics provides information about how your body may process certain nutrients differently based on your genetics. It does not generate a meal plan or prescribe a specific diet. Dietary decisions should factor in genetics alongside lab work, health history, and guidance from a healthcare provider or registered dietitian.

Is nutrigenomics the same as pharmacogenomics?

They are related but distinct fields. Pharmacogenomics studies how genes affect drug metabolism. Nutrigenomics studies how genes affect nutrient metabolism. Both use genetic data to provide personalized health context, but they focus on different substances and different gene sets.

Can I use my 23andMe or AncestryDNA data for nutrigenomics?

Yes. Consumer genotyping arrays include the key SNPs for MTHFR, COMT, FUT2, VDR, BCMO1, TCN2, and other nutrigenomic genes. Your raw data can be analyzed for these variants without needing a new test.

Does a nutrigenomics report replace blood work?

No. Genetics can indicate how your body may metabolize certain nutrients, but only blood work can measure your actual nutrient levels. A nutrigenomics report and blood work provide complementary information — genetics shows predisposition, lab tests show current status.