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Lifestyle risk factors and residual life expectancy at age 40: a German cohort study

Abstract (provisional)

Background

Cigarette smoking, adiposity, unhealthy diet, heavy alcohol drinking and physical inactivity together are associated with about half of premature deaths in Western populations. The aim of this study was to estimate their individual and combined impacts on residual life expectancy (RLE).

Methods

Lifestyle and mortality data from the EPIC-Heidelberg cohort, comprising 22,469 German adults >=40 years and free of pre-existing diabetes, cardiovascular disease and cancer at recruitment (1994-1998), were analyzed with multivariable Gompertz proportional hazards models to predict lifetime survival probabilities given specific baseline status of lifestyle risk factors. The life table method was then used to estimate the RLEs.

Results

For 40-year-old adults, the most significant loss of RLE was associated with smoking (9.4 [95% confidence interval: 8.3, 10.6] years for male and 7.3 [6.0, 8.9] years for female heavy smokers [>10 cigarettes/day]; 5.3 [3.6, 7.1] years for men and 5.0 [3.2, 6.6] years for women smoking 4 drinks/day, 3.1 [1.9, 4.0] years for men), and high processed/red meat consumption (>=120 g/day, 2.4 [1.0, 3.9] years for women). The obesity-associated loss of RLE was stronger in male never smokers, while the loss of RLE associated with low BMI was stronger in current smokers. The loss of RLE associated with low leisure time physical activity was moderate for women (1.1 [0.05, 2.1] year) and negligible for men (0.4 [-0.3, 1.2] years). The combined loss of RLE for heavy smoking, obesity, heavy alcohol drinking and high processed/red meat consumption, versus never smoking, optimal BMI (22.5 to 24.9), no/light alcohol drinking and low processed/red meat consumption, was 17.0 years for men and 13.9 years for women.

Conclusions

Avoiding basic lifestyle risk factors, particularly cigarette smoking and unhealthy body weight, could substantially increase the RLE of middle-aged adults and should be the top public health priority to reduce premature deaths in Germany and similar affluent societies.

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Alex's notes: Always interesting to see data supporting the notion that unhealthy lifestyle factors such as being fat reduce life-expectancy. Duh.

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