I don't drink. I don't smoke. I tried weed and found it uninteresting and never did anything harder. I exercise regularly.
But I'll still never be the platonic ideal of a "healthy person", because whenever I'm sad, I need processed sugar to feel like a person again. And brother, does life give me reasons to be sad.
Samesies. I remember back in college powering through a writing assignment with a 2L bottle of Coke and a 1lb. bag of M&Ms. Totally not healthy, but I learned later that it has to do with the relationship between insulin and neurotransmitters, like dopamine.