People are always looking for miracles and “secrets” to improve their health. Well, there aren’t any. But as near as I can tell here’s the things you can do that will meaningfully improve your health more than just statistical variation:

1) If you can help it, don’t be fat (and don’t let your weight oscillate in the attempt to not be fat).

2) Lift weights, heavy ones, at least 3x a week. This shows large improvement in health outcomes even for people who start in their eighties.

3) Don’t sit down a lot. Most office workers can’t avoid this easily, but sitting seems terrible for health.

Those three things will get you 80% of the way to living as long as your genes will naturally allow you to. The rest is just wasting time (yep, including healthy eating).