Like many health-boosting nutrients, probiotics don't function in isolation. They require food, or “prebiotics” — including oligosaccharides and inulin (forms of soluble fiber found in some grains, fruits, and vegetables) and phenols (antioxidant compounds also found in plant foods). Eating more of the following prebiotic-rich foods can help support your probiotic numbers.

Asparagus Jerusalem artichokes
Bananas Leeks
Barley Oats
Beans Onions
Beer (microbrews) Peanuts
Berries Peas
Cherries Red wine
Dark chocolate Soybeans
Eggplant Tea
Garlic Whole rye
Herbs, fresh Whole wheat