Rest is paramount. I'm not sure when people began to think it's so heroic to push past our natural limits and deprive ourselves of adequate sleep. Nothing good ever comes from that. If I miss more sleep than I should, it takes days for me to recover.

Fresh fruits and veggies, healthy organic if possible, no chemically treated water (fluoride, chlorine, etc.) and no refined sugars. sigh It's a tall order, but I'm trying.