Avoid artificially concentrated sugars. Don’t drink soda or eat candy. Trans fats are almost certainly bad as well, (but are slowly being replaced in most foods). Don’t drink too much alcohol. (Also, don’t smoke)
The field of nutrition is a mess, but I think the above claims are genuinely noncontroversial, and can lead to larger improvements than any other general or exotic nutritional advice.
Some low-hanging fruit:
Avoid artificially concentrated sugars. Don’t drink soda or eat candy. Trans fats are almost certainly bad as well, (but are slowly being replaced in most foods). Don’t drink too much alcohol. (Also, don’t smoke)
The field of nutrition is a mess, but I think the above claims are genuinely noncontroversial, and can lead to larger improvements than any other general or exotic nutritional advice.