The prebiotics with the most positive research are inulin and oligofructose, explains Jackson Siegelbaum Gastroenterology. These prebiotics are found in root vegetables, such as chicory root and wild yams. Other foods that contain these prebiotics include wheat, onions, garlic, bananas and leeks, as well as artichokes, jicama and agave.
Prebiotics are a type of nondigestible product that induce the growth or activity of microorganisms, such as bacteria or fungi, for beneficial results in the host. Prebiotics may assist in relieving abdominal pain, bloating and constipation, though the results of clinical studies have been mixed, according to WebMD. Some studies suggest that the consumption of probiotics alongside prebiotics may achieve better results.