Why one-size-fits-all health advice was never built for Indian biology

There is a moment, somewhere in your late twenties or early thirties, when the wellness advice you have been ignoring all your life suddenly seems to apply to you. The doctor mentions cholesterol. A cousin gets diagnosed with diabetes. Your mother starts asking when you last had a blood test. You go to the internet, the internet sends you to a wellness influencer in California, and the wellness influencer tells you to try intermittent fasting, switch to oat milk, take a vitamin D3 supplement of 1,000 IU, and walk ten thousand steps a day.

Most of that advice was developed for a person who does not look like you, does not eat like you, and does not metabolise food the way your body does. Some of it will work. Some of it will not. A small fraction of it might actively hurt. The strange thing is, nobody is lying. The research the influencer is drawing on is real research. It just was not done on Indians.

Three things the global handbook gets wrong about Indian bodies

Take the simplest example. The 2025 South Asian genome study published on bioRxiv pulled genetic data from roughly eight thousand individuals across India, Pakistan, and Bangladesh and looked at one of the most studied genes in human biology, LCT, the lactase gene. In most Northern European populations, somewhere between fifty and ninety percent of adults carry a variant that lets them digest milk into adulthood. In most South Asian populations, the figure is closer to twelve percent. The default state across the subcontinent is lactase non-persistence. We stopped making the enzyme around the time we were weaned, and never started again.

And yet India produces more dairy than any other country on earth. Doodh and dahi and paneer are not optional features of the Indian plate, they are foundational. The biology and the culture are out of phase. Most of us have been quietly negotiating with the consequences our whole lives. The bloating after the second chai. The discomfort after the heavy paneer dinner. The vague sense that something is off. Most Indians do not have lactose intolerance as a diagnosed condition. Most Indians have lactose intolerance as the unexamined background hum of their digestion.

The standard Western advice ("cut dairy if it bothers you, otherwise it is fine") is built for a population where lactase persistence is the rule. For us, the rule is the opposite, and the advice needs to be reversed. Smaller portions. Fermented forms first (dahi and chaas before milk). The right kind of paneer, in the right quantity, at the right time of day. Or, if the data says so, a clean switch.

Vitamin D, calibrated to the wrong baseline

Move to vitamin D. The studies in urban Asian Indian cohorts are not subtle. Mean serum 25(OH)D levels in one well-cited Indian study sat at around 9.8 nanograms per millilitre, which is squarely in the deficient range, and ninety-four percent of the subjects met clinical deficiency criteria. This is not a small effect in a small sample. This is a feature of how South Asian skin, melanin, and modern indoor life interact with the latitude of the subcontinent. Darker skin synthesises vitamin D more slowly. Air-conditioned office life cuts sun exposure further. The dietary sources of vitamin D in a typical Indian vegetarian diet are limited. The deficiency is not unusual. It is the median state.

The standard global supplementation advice (1,000 IU per day, sometimes 2,000) was calibrated against populations that are not starting from this baseline. For an Indian adult with deficient or insufficient status, that dose can be too low to move the needle for months. And the response itself is genetic. Variants in the VDR gene, particularly the FokI and BsmI polymorphisms, change how efficiently your cells respond to whatever vitamin D is in your blood. Two people taking the same supplement, eating the same dinner, and getting the same sun exposure can end up with very different downstream effects on bone density, immune function, and cardiovascular markers.

This is not a reason to take more. It is a reason to test, dose, retest, and personalise, which is exactly the protocol almost no general physician in India actually runs.

A decade-younger heart attack

The third example is the one we should have been talking about for thirty years. Cardiovascular disease in South Asians arrives roughly a decade earlier than it does in Western populations. Multiple large studies (npj Cardiovascular Health published a 2025 systematic review, the BRAVE study out of Bangladesh, the ScienceDirect review on South Asian ASCVD) have converged on the same finding. Indians have their first myocardial infarction about ten years younger than Caucasians on average. The risk profile is also strange: thinner, lower BMI, often non-smoking patients are showing up in cardiac wards in their forties. The standard Framingham risk calculator, which was built on the Framingham, Massachusetts cohort beginning in 1948, systematically underestimates risk for us.

Some of this is lifestyle and some of it is genetic. FTO variants are associated with type 2 diabetes risk in South Asians in ways that do not always show up in European cohorts. Lipoprotein(a) levels, a less famous cardiovascular risk marker that conventional cholesterol panels do not measure, run higher in South Asian populations. The dyslipidaemia pattern is its own dialect: lower HDL, higher triglycerides, more abdominal fat at lower body weights. None of this means South Asians are doomed. It means the playbook has to be different.

So what to actually do

The first move is the easiest one. Stop applying advice that was not built for you. The keto diet was tested largely on European and American populations. Intermittent fasting protocols have their best evidence in similar cohorts. The "eat more leafy greens" gospel, taken seriously, runs into iron absorption interactions specific to a vegetarian Indian diet. None of these are wrong. But none of them are guaranteed to work for the person reading this article, because the studies they came from were not run on the person reading this article.

The second move is to find out where your own biology actually is. The standard battery for an Indian adult who wants to take preventive care seriously runs something like this: an HbA1c and fasting insulin (not just fasting glucose), a full lipid panel including ApoB and Lp(a) if you can get them, a 25(OH)D level, a B12 level, a basic thyroid panel, and, increasingly, a wellness-focused DNA panel that covers the variants relevant to South Asian biology: LCT for lactose, MTHFR for folate metabolism, CYP1A2 for caffeine, FTO and TCF7L2 for metabolic risk, VDR for vitamin D response, and the cardiovascular set.

None of these tests by itself tells you what to do. Together, they tell you which of the global wellness recommendations actually apply to you, and which you can safely ignore. That is the only honest version of personalised wellness. Not a coloured chart that promises optimisation, but a set of facts about your own metabolism that lets you stop guessing.

If you want to start somewhere

If you have never had a DNA wellness panel done, that is the highest-leverage single test you can run in your thirties. It is a one-time blood or saliva sample. The report is reusable for the rest of your life. Your genes do not change. The price has dropped dramatically over the last five years. The interpretation has gotten markedly better. And for South Asian readers specifically, the new wave of Indian-population-trained tests have begun to close the gap between what the technology can do and what it can do for you.

We have spent a few months looking at the options available in India and the wellness DNA panel we currently recommend covers diet response, fitness type, weight management, nutrition absorption, cardio-metabolic risk, and skin and sleep markers. It runs on a saliva sample collected at home and the report is delivered in two weeks, with an included counsellor session to walk you through what the numbers actually mean for your daily decisions. We have no commercial stake in which brand of test you pick. But if you would like to look at the one we use ourselves, the link below opens directly to the order page.

RECOMMENDED · DNA WELLNESS PANEL. Saliva collection at home. 14-day turnaround. Covers diet, fitness, weight, nutrition, cardio-metabolic, skin, and sleep markers, calibrated against South Asian reference data. Includes a 30-minute counsellor session to interpret the report. From ₹X,XXX. Order the wellness panel.

If you would rather not test yet, do this instead. Get the 25(OH)D level checked at your next blood draw, get a lipid panel that includes ApoB if your lab offers it, and start treating dairy with the suspicion your biology probably already justifies. Those three moves alone will tell you more about your wellness baseline than three months of generic supplements ever will.

The genetic luck that decides where you start is not under your control. What you do once you know where you are starting, that almost entirely is.

Sources cited or referenced in this article

Revisiting the Evolution of Lactase Persistence: Insights from South Asian Genomes, bioRxiv, November 2025.

Prevalence and functional significance of 25-hydroxyvitamin D deficiency and vitamin D receptor gene polymorphisms in Asian Indians, American Journal of Clinical Nutrition.

Drivers of Atherosclerotic Cardiovascular Disease in South Asians, Current Insights and Future Directions, JACC: Asia, 2026.

Addressing myocardial infarction in South-Asian populations, npj Cardiovascular Health, 2025.

FTO gene variants are strongly associated with type 2 diabetes in South Asian Indians, Diabetologia.

Disentangling Dual Threats: Premature Coronary Artery Disease and Early-Onset T2DM in South Asians, Journal of the Endocrine Society, 2023.