Given the huge number of smokers and obese people, I daresay the things I said in the grandparent are not that obvious (or most people aren't interested in living longer).
"Obvious to the population as a whole" and "obvious to a LessWrong reader" probably differ dramatically. I don't think repeating the advice is necessarily bad, since those are common points of failure, but the value of the advice is probably fairly minimal.
From Costanza's original thread (entire text):
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