I don't consider my favorite, I consider the best fruits.
Blueberry - this is the one of best fruit you can use for your health, if you can find WILD Blueberries you will make your health better, of course you need to exercise and good diet will help, blueberry is not magic, but is full of antioxidants and is one of best over there.
Grapefruit & Grape (of wine) - Can handle and destroy Candidiase, just make a juice everyday with Grape
Celery - Wonderful, for optimizing your liver and destroy some pathogens and other things in your organism.