Apparently, careful study (a meta analysis of research into lifestyle and longevity) shows that:
1. Doing everything right (in terms of blood pressure, booze, fags, cholesterol, obesity, diet, exercise and occupation) makes a total difference of about 4 years to your lifespan.
2. One of the best predictors of how long you'll live is: how good you feel and how long you expect to live.
This is from an excellent book - 'Dance With Chance' - which looks at this subject in some detail (as well as other interesting topics such as whether we can predict the stock market performance).
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