Secrets to good health.
For most people, the lion's share of it is lifestyle choices.
Then, as if to keep people from becoming too self righteous, heredity plays a role. Some health problems are based on genetics. A friend of mine was ask what his secret to good health is. One of his answers says, to "choose your grandparents wisely."
Well, I guess there isn't a lot we can do about that one.
The roulette wheel also plays a role in determining health. Some things happen just do to shear chance. Most people know of at least one chain smoker who lives a robust 98 years. Maybe everyone knows that same chain smoker.
Also everyone knows one jogger who drops from a heart attack at 38.
To some extent, it's a crap shoot, but one can stack the odds in one's favor with a healthy lifestyle.
I think lifestyle is the lion's share for most people, so get out there and play. Go dancing, walking, biking. Keep eating those carrots and apples.