Meta analysis of milk consumption studies suggests a significant decrease in CVD. Some studies show a marginal increase in prostate cancer in men, but as this is a highly treatable cancer and a much smaller effect size than the CVD reduction it seems like a great tradeoff. As expected if this was true, overall mortality is lower for milk drinkers.
Lactose intolerance isn't evenly distributed through the population, so it might be a confounding factor.
Dying or becoming severely physically/mentally ill is very likely going to significantly lower the output of your utility function, so it would probably be a very bad idea to ignore the low-hanging resources which can significantly extend the time for which you are alive and well. I have attempted to search LessWrong for a list of such resources, and haven't been able to find one.
Are there any books, websites, or posts that contain significantly low-hanging fruit in this area? If so, please list them in the comments below.