Poor Diet May Raise Genetic Cholesterol Risk in Chennai Study

A poor quality diet may raise the effect of genetic risk for high blood cholesterol in Asian Indian adults, a study of 1,020 men and women from Chennai has found. The study was published in PLOS One on October 14, 2026. It forms part of the Chennai Urban Rural Epidemiology Study, known as CURES 165, and it looked at diet, genes and serum total cholesterol together rather than in isolation.

Researchers built a genetic risk score from three variants. They then examined how diet quality interacted with that score to shape serum total cholesterol. Total cholesterol in the blood is a marker tied to cardiovascular disease. The central finding was an interaction: diet quality changed how strongly genetic predisposition showed up in cholesterol levels.

What the researchers examined

The work focused on Asian Indian adults in Chennai, in southern India. The sample covered 1,020 men and women. Each person had a diet quality assessment and a genetic risk score based on the three variants used in the study. The team studied how those two factors worked together in relation to serum total cholesterol.

That design matters because genes alone do not tell the full story in the study. A person could carry a higher genetic risk, but the study asked whether the quality of the diet made that risk stronger or weaker in its link with cholesterol. The answer pointed to poor diet as a factor that may amplify the genetic effect.

Why the finding matters

High cholesterol is tied to cardiovascular disease, and the study coverage links the issue to wider risks that include diabetes, stroke and heart attack. For readers, the practical point is direct. Genes cannot be changed. Diet can be changed. If a poor diet raises the effect of a genetic predisposition, then improving diet becomes a prevention step that people and health programmes can act on.

The study did not, in the coverage of its findings, give a single simple effect size that sums up the interaction for every reader. Its message is broader and more careful: inherited risk and daily food choices should not be treated as separate problems. They work together, and that joint effect is what prevention work needs to address.

A population that faces risk early

The background to the study is important. Asian Indian populations tend to develop cardiometabolic disorders at lower body weights and at younger ages than many other groups. That pattern means risk can appear in people who do not fit the common picture of who should be worried about heart and metabolic disease.

The burden of type 2 diabetes and cardiometabolic disease has also risen sharply in southern India in recent decades. Chennai sits in that region, and the CURES work is based there. With that burden rising, researchers have strong reason to look for factors people can modify in daily life. Diet is one of those factors, which is why the study places it at the centre of prevention thinking.

What happens next

The next step implied by the findings is prevention that takes both genes and diet seriously. Researchers point to prevention strategies for India and for diaspora communities, where the same population background and the same need for early action apply. The study supports attention to diet quality as a lever people can use, even when genetic risk is present.

For individuals, the study does not replace medical advice or a cholesterol test. It adds a reason to take food quality seriously, in particular for adults who know that high cholesterol, diabetes, stroke or heart disease run in their family. The journal article carries the DOI 10.1371/journal.pone.0357182 for readers who want to check the full study record.