It never hurts to eat foods that heal and avoid those that kill (see this website), do the Water Cure , etc.
Richard Schulze 800-herbdoc has information about garlic supositories in his book "There are no incurable diseases." That probably wouldn't hurt if your wife is ok with it.
It is a good idea to treat your body like you would if you already had a disease....clean diet, low stress, etc. Don't wait for the dis-ease to force you to do it.