yeah... mostly I said it that way because this take upsets some people. The full list (which I think are 80+% fixable by lifestyle) is something like: sleep apnea, obesity, back pain, most things that require physical therapy outside of injuries, probably orthotics and myopia, depression, ADHD, anxiety... probably there are others I'm not thinking of also.

I would like to also include cancers since we cause most of them but that is maybe a different category. Although I have heard of theories that suggest diet can reduce skin cancer (e.g. the mediterranean diet phenomenon) as well as one that suggests exercise can reduce prostate cancer (by strengthening the muscles surrounding veins to prevent testosterone from leaking into the prostate), and of course smoking-related cancers are entirely preventable, so I would not be surprised if there are a lot more that are prevented by health lifestyles.

Generally it doesn't seem to work to just tell people to be healthy, though; to really get any of this work you need society at large to be structured in a healthy way so that it becomes the default instead of an act of willpower. But that seems.. imminently doable, if people want to do it. However it's a huge change, so it takes a movement. For example you pretty much have to make people's lifestyles more walking-oriented, which means rearranging society completely.