Researchers studied nearly 8,000 Japanese adults across two cohorts to see how genetic risk scores and lifestyle habits interact in predicting type 2 diabetes. People with high polygenic risk scores were up to 4.5 times more likely to develop diabetes than low-risk individuals. Crucially, those same high-risk people who exercised regularly and avoided hypertension and dyslipidemia showed meaningfully lower diabetes rates. Adding genetic scores to standard clinical prediction models also improved accuracy. The findings suggest that genetic testing could help identify who needs the most aggressive lifestyle intervention, while reinforcing that healthy habits remain powerful even for those dealt a difficult genetic hand.
