Good question.
Its probably easier to list things they shouldn't be doing that are known to significantly reduce life expectancy (e.g. smoking). I would guess it would mainly be obvious things like exercise and diet, but it would be interesting to see the effects quantified.
What about vitamins/medication? Isn't Ray Kurzweil on like fifty different pills? Why isn't everyone?
From Costanza's original thread (entire text):
Meta: