"If man will think only thoughts of perfect health, he can cause within himself the functioning of perfect health; and the Power of Life will be exerted to assist him. But this healthy functioning will not continue unless man performs the external, or voluntary, functions of living in a healthy manner.

Man's first step must be to learn how to think perfect health; and his second step to learn how to eat, drink, breathe, and sleep in a perfectly healthy way. If man takes these two steps, he will certainly become well, and remain so."

from " The Science of Being Well" by Wallace D. Wattles

I'd add the spiritual componenent, and in my series "What worked for me", I'll talk more about my 3 pronged approach to wellness.