Probably the most underrated ways to keep your body healthy, is staying hydrated. Drink a big glass of water first thing in the morning. Stay away from caffeine, and drink water every 2-3 hours throughout the day. Everything that every organ system in your body does, requires using water. Being dehydrated is like not having oil in your car engine.
I don't want to die, and I accept that I won't live forever in this universe. I don't subscribe to any religions, and I have no reason to believe anything happens after we die. I know that I can't explain how/why I got here. The fact that I'm here is completely inexplicable. It seems like there's a one in infinity chance that I would have ever opened my eyes and be alive. But, if it can happen once, that sets a precedent it could happen again. If it was good for me to be alive once, why wouldn't it be good for me to live again?