I believe that if you're healthy, you're capable of doing everything. There's no one else who can give you health but God, and by being healthy I believe that God is listening to me.
I made a commitment to completely cut out drinking and anything that might hamper me from getting my mind and body together. And the floodgates of goodness have opened upon me - spiritually and financially.
I really believe the only way to stay healthy is to eat properly, get your rest and exercise. If you don't exercise and do the other two, I still don't think it's going to help you that much.