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Gene-lifestyle interaction and type 2 diabetes: the EPIC interact case-cohort study
Claudia Langenberg1, Stephen J Sharp1, Paul W Franks2
1Medical Research Council Epidemiology Unit, University of Cambridge, Cambridge, United Kingdom.
Plos Medicine
|May 22, 2014
Summary
Genetic risk for type 2 diabetes (T2D) is higher in younger, leaner individuals. However, obesity poses a significant absolute risk, emphasizing universal lifestyle interventions for T2D prevention.
Area of Science:
- Genetics
- Epidemiology
- Public Health
Background:
- Type 2 diabetes (T2D) genetic research has advanced, but interactions between genetic variants and lifestyle factors require further investigation.
- Previous studies lacked the statistical power to systematically analyze these complex interactions.
Purpose of the Study:
- To quantify the combined effects of genetic predisposition and lifestyle factors on T2D risk.
- To inform evidence-based strategies for T2D prevention.
Main Methods:
- Utilized data from the InterAct study, including 12,403 incident T2D cases and 16,154 controls from 340,234 European participants.
- Employed Prentice-weighted Cox regression and random effects meta-analysis to assess genetic risk scores and lifestyle factors.
- Analyzed interactions between genetic risk score and age, body mass index, waist circumference, sex, family history, physical activity, and diet.
Main Results:
- The genetic risk score for T2D had a greater relative effect in younger and leaner individuals (lower BMI, waist circumference).
- Absolute T2D risk was substantially higher in obese individuals (4.22%–7.99%) compared to normal-weight individuals (0.25%–0.89%) across genetic risk quartiles.
- No significant interactions were found between the genetic score and sex, family history, physical activity, or Mediterranean diet adherence.
Conclusions:
- While genetic T2D risk is more pronounced in younger, leaner individuals, their absolute risk remains low.
- Obesity represents a critical, high-absolute-risk factor for T2D, irrespective of genetic predisposition.
- Universal lifestyle interventions are recommended for T2D prevention due to the significant impact of obesity.
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