A study published in BMJ Evidence-Based Medicine suggests that adopting a healthy lifestyle could counteract the impact of life-shortening genes by more than 60%. The analysis, drawing from several large long-term studies, underscores the significant role of lifestyle choices in determining lifespan.
Researchers examined data from 353,742 adults enrolled in the UK Biobank between 2006 and 2010, tracking their health outcomes until 2021. They evaluated participants' genetic predisposition using a polygenic risk score (PRS) and assessed lifestyle factors such as tobacco use, alcohol consumption, diet quality, sleep patterns, and physical activity levels.
Findings revealed that individuals with a genetic predisposition to shorter lifespans faced a 21% higher risk of premature death, regardless of lifestyle. Similarly, those with unhealthy lifestyles were 78% more likely to die prematurely, independent of genetic factors. Notably, participants with both high genetic risk and unfavorable lifestyles were twice as likely to die early compared to those with low genetic risk and healthy lifestyles.
Four key lifestyle factors—non-smoking, regular physical activity, sufficient sleep, and a healthy diet—emerged as crucial components of an optimal lifestyle combination. Adopting these habits was associated with the most significant reduction in premature mortality risk.
While the study's observational nature precludes definitive causal conclusions, the findings underscore the potential of lifestyle interventions to mitigate genetic risks. Researchers suggest that individuals at high genetic risk of premature death could extend their life expectancy by nearly 5.5 years at age 40 through adherence to a healthy lifestyle.
The study highlights the importance of public health policies aimed at promoting healthy lifestyles, particularly in mitigating the impact of genetic factors on lifespan. By emphasizing lifestyle modifications early in life, policymakers and healthcare professionals can help individuals offset genetic predispositions to premature mortality and enhance overall longevity.
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