The Salerno School of Medicine is simple (if you are able to read Latin.) Si tibi deficiant medici, medici tibi fiant haec tria, mens laeta, requies, moderata diaeta.
In English: If you don’t have a physician, let these three things be your medicine, joyful mood, rest, and don’t eat much.
I prefer to live without a physician as much as I am able and these rules work well. Be happy, get good sleep, and eat as little as you must.
I don’t know if they’re right, but the principles align with what makes me feel good. Therefore, I concur.