Conserve the vital energy, follow a balanced diet, and always smile and be happy. He who finds joy within himself discovers that his body is charged with electric current, life energy, not from food but from God. If you feel that you can't smile, stand before a mirror and with your fingers pull your mouth into a smile. It is that important!
Paramahansa YoganandaIn vegetables and fruits, God has infused medicinal power to help in overcoming disease. Even these, however, have but a limited potency. The organs of the body are essentially sustained by the energy of God, and the person who employs various methods to increase this energy will have at his command a greater power for healing than is afforded by any medicine or diet.
Paramahansa Yogananda