Nutrigenomics 101

What is nutrigenomics?

Nutrigenomics is the study of how your individual genetic variants — single-nucleotide polymorphisms (SNPs, pronounced 'snips') — influence your response to specific nutrients, foods, and dietary patterns. Your DNA does not determine your destiny. It reveals your tendencies: how efficiently you absorb certain vitamins, how you metabolise different fats, whether you are predisposed to certain deficiencies, and which dietary patterns are most likely to work for your specific biology. Two people can follow identical diets and have completely different outcomes — nutrigenomics explains much of that variation.

Key genes explained

MTHFR — folate and methylation

MTHFR encodes an enzyme that converts folate into its active form (5-MTHF). The C677T and A1298C variants — carried by approximately 40% of South Asians — reduce this enzyme's efficiency by 30–70%. Consequences: poor folate metabolism, elevated homocysteine (an independent cardiovascular risk factor), and impaired methylation (a fundamental cellular process). Response: individuals with MTHFR variants need methylated folate (5-MTHF) — not synthetic folic acid — and methylcobalamin B12, not cyanocobalamin.

APOE — fat metabolism and cardiovascular risk

APOE determines how efficiently you clear lipoproteins from your bloodstream. The ε4 allele — present in ~15–20% of people — means saturated fat raises your LDL-C more significantly than in ε2 or ε3 carriers. APOE ε4 individuals benefit most from a Mediterranean-type diet with lower saturated fat. APOE ε2 carriers have lower cardiovascular risk and tolerate a higher saturated fat intake. This is why a high-ghee diet works beautifully for some people and raises cholesterol significantly in others.

FTO — body weight and satiety

The FTO gene is the most replicated obesity-associated gene in research. Individuals carrying the risk A allele have a 20–30% higher risk of obesity per allele and lower baseline satiety hormone levels (GLP-1, PYY). This does not mean weight loss is impossible — it means these individuals require a higher-protein diet to achieve the same satiety, and respond better to resistance training. Identifying this variant removes the self-blame and directs energy toward what actually works.

VDR — vitamin D absorption

The vitamin D receptor gene determines how efficiently your cells respond to vitamin D. The ff genotype (VDR Fok1) significantly reduces receptor sensitivity, meaning these individuals need higher circulating 25(OH)D levels to achieve the same biological effect. Combined with India's paradox — high UV exposure in theory, but chronic Vitamin D deficiency in practice due to skin pigmentation, indoor lifestyles, and air pollution — VDR variants explain why many Indians require 2,000–4,000 IU/day supplementation to maintain optimal levels.

CYP1A2 — caffeine metabolism

CYP1A2 determines how quickly you break down caffeine. Fast metabolisers process caffeine efficiently; coffee consumption is associated with neutral or protective effects on cardiovascular health for them. Slow metabolisers retain caffeine much longer. For slow metabolisers, even moderate coffee consumption has been associated with increased cardiovascular risk markers. This explains why some people can drink 3 cups and sleep fine, while others feel anxious after one.

BCMO1 — beta-carotene to Vitamin A conversion

Beta-carotene from carrots, leafy greens, and orange vegetables must be converted to active Vitamin A (retinol) by the BCMO1 enzyme. Variants in this gene reduce conversion efficiency by 50–90%. Individuals with poor BCMO1 function who rely entirely on plant sources for Vitamin A (common among vegetarians) are at high risk of Vitamin A deficiency despite eating well. The response: prioritise pre-formed Vitamin A from dairy and eggs, or targeted supplementation.

How the test works

Sample collection

A simple cheek swab or saliva sample — no blood draw required. Collected at home with a kit, sent to a CLIA-certified laboratory.

Analysis

The DNA is extracted and analysed for 50–100+ SNPs relevant to nutrition, metabolism, hormones, and inflammation. Results are returned in 2–4 weeks.

Interpretation

The raw genetic data alone is not clinically useful — it is a probability map that must be interpreted in the context of your blood tests, symptoms, lifestyle, and goals. This is the critical step most DTC genetic test companies skip.

The Yogyaahar approach

A 90-minute consultation with Dt. Trishala interprets your results alongside your complete clinical picture. The output is a personalised nutrition protocol — not a generic report.

Who benefits most from nutrigenomics testing

• ·People who have followed multiple diets without seeing expected results
• ·Anyone with a strong family history of diabetes, cardiovascular disease, or obesity
• ·Women with PCOS or hormonal imbalances where standard dietary advice has not worked
• ·Athletes looking to optimise performance, recovery, and body composition
• ·Individuals with unexplained nutrient deficiencies despite adequate dietary intake
• ·Anyone wanting to understand their body's nutritional blueprint rather than following generic advice
• ·People with elevated homocysteine or cardiovascular risk where MTHFR testing is clinically relevant

What nutrigenomics cannot tell you

Genetic information has real limits. Understanding these is as important as understanding the benefits:

• ·It is not a disease diagnosis — genetic risk is probabilistic, not deterministic
• ·It cannot override or replace blood test results — labs reveal what is currently happening; genes reveal tendency
• ·Epigenetics means your gene expression changes with lifestyle. A variant associated with increased risk is not a sentence — it is a signal to act
• ·It cannot predict exact outcomes — two people with identical variants will respond differently based on their microbiome, stress levels, sleep, and overall diet
• ·DTC tests (23andMe, etc.) do not provide the clinical interpretation needed to act on nutritional variants safely