Japan has the number one life expectancy of any nation; the US
falls around 19th. A study recently suggested that eating a
single serving of berries every day could add an extra year to
our lifespan. The available evidence also suggests that eating
nuts may extend our life by years. A plant based diet overall is
thought to be capable of reversing heart disease and, thus,
extending the lifespan (see also here, here, here, here).
However, British vegetarians do not appear to live longer than
British meat eaters (possibly due to the fact that they are less
likely to supplement their diet with vitamin B12). And lastly,
coffee has been associated with decreased all-cause mortality.
Besides diet, sleeping 7 hours a night may maximize longevity.
Severe caloric restriction has been found to extend the lives of
animals in laboratories. On the other hand, there are a number
of vitamin supplements that have been found to increase all-
cause mortality, or shorten the lifespan (see also here). Iron
pills have also been lin