"Science and Health," by Mary Baker Eddy, teaches Mind-health and -healing.
More down-to-matter, five servings of vegetables and fruits daily.
Less pork, heavy cuts of beef, no refined sugar if at all possible, few "saturated fats."
Regular, moderate exercise; perhaps some stretching/yoga, some cardiovascular training, some weight training.
Regular prayer, comfort in a "Higher Power"/"Source."
Meditation e.g.
http://www.easwaran.org
Attention to dreams ("Watch Your Dreams," Ann Ree Colton, "The Masters and Their Retreats," Mark Prophet, and "The Master of Lucid Dreams," Dr. Olga Kharitidi, as an important way of caring for and championing one's inner childlike joy, love, and healing childishness.
A loving spouse. A sacred labor employment. A cheerful attitude.
More esoterically, Edgar Cayce noted that bitter almonds and apricot kernels (1 to 3 a day) tend to heal/prevent "cancer."
Detoxification of and avoidance of food dyes, plastic "fumes" (e.g., "new furniture/new car 'smell'," etc.
Adequate, regular, and good-quality sleep (7 hours/night on average, perhaps a half-hour nap during afternoon).