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Chicory root is considered the richest natural source. Other traditional dietary sources of prebiotics include [[beans]], [[Jerusalem Artichoke]], [[jicama]], raw [[oats]], unrefined wheat, unrefined [[barley]], and [[yaconyacón]]. Some of the oligosaccharides that naturally occur in [[breast milk]] are believed to play an important role in the development of a healthy [[immune system]] in infants.<ref>{{cite web |last=Jackson |first=Frank |title=Breast Milk |url=http://www.prebiotin.com/breast-milk/ |publisher=Jackson GI Medical |accessdate=23 April 2013}}</ref>

| Raw, Dry [[LeekLeeks]]

| Raw [[Wheat bran]]

| Whole [[Wheat flour]], Cooked

| Raw [[BananaBananas]]

| colspan="2" | Source:<ref name="ReferenceB">{{Cite journal |author=Moshfegh AJ, Friday JE, Goldman JP, Ahuja JK |title= Presence of inulin and oligofructose in the diets of Americans |journal=Journal of Nutrition |date=July 1999 |volume=129 |issue=7 Suppl |pages=1407S–1411S |PMID=10395608}}</ref>

 While there is no broad consensus on an ideal daily serving of prebiotics, recommendations typically range from {{convert|4|to(-)|8|g}} for general digestive health support, to {{convert|15|g}} or more for those with active digestive disorders. Given an average {{convert|6|g}} serving, below are the amounts of prebiotic foods required to achieve a daily serving of prebiotic fiber: {| class="wikitable"|-! Food! Amount of food to achieve 6&nbsp;g serving of prebiotics|-| Raw Chicory Root| {{convert|9.3|g|abbr=on}}|-| Raw [[Jerusalem ArtichokeCategory:Treatments]]| {{convert|19|g|abbr=on}}|-| Raw [[Dandelion]] Greens| {{convert|24.7|g|abbr=on}}|-| Raw Garlic| {{convert|34.3|g|abbr=on}}|-| Raw Leek| {{convert|51.3|g|abbr=on}}|-| Raw Onion| {{convert|69.8|g|abbr=on}}|-| Cooked Onion| {{convert|120|g|abbr=on}}|-| Raw Asparagus| {{convert|120|g|abbr=on}}|-| Raw Wheat [[Bran]]| {{convert|120|g|abbr=on}}|-| Whole Wheat Flour, Cooked| {{convert|125|g|abbr=on}}|-| Raw Banana| {{convert|600|g|lb|abbr=on}}|-| colspan="2" | ''Source''<ref name="ReferenceB"/>|} Those wishing to ensure sufficient prebiotic intake should carefully consider the prebiotic content of their diet, as well as what caloric and nutritive load comes along with itCategory: e.g., eating {{convert|600|g|lb}} of bananas daily is likely to provide an excess of calories from sugars and carbohydrates to the diet. Prebiotic fiber supplements with minimal caloric, fat, and sugar load are also available. Prebiotic oligosaccharides are increasingly added to foods for their health benefits. Some oligosaccharides that are used in this manner are [[fructooligosaccharidePrebiotics]]s (FOS), [[xylooligosaccharide]]s (XOS), [[polydextrose]], and [[galactooligosaccharides]] (GOS). Moreover disaccharids like [[lactulose]] or some monosaccharides such as [[tagatose]] are also used sometimes as prebiotics.{{Citation needed|date=January 2008}} Also in petfood, [[mannooligosaccharide]]s are being used for prebiotic purposes. Genetically engineering plants for the production of inulins has also become more prevalent,<ref>{{Cite journal |author=Ritsema T, Smeekens SC |title=Engineering fructan metabolism in plants |journal=J Plant Physiol |year=2003 |volume=160 |pages=811–820 |doi=10.1078/0176-1617-01029 |pmid=12940548 |issue=7}}</ref><ref>{{Cite journal |author=Weyens G, Ritsema T, Van Dun K, Meyer D, Lommel M, Lathouwers J, Rosquin I, Denys P, Tossens A, Nijs M, Turk S, Gerrits N, Bink S, Walraven B, Lefèbvre M, Smeekens S |title=Production of tailor-made fructans in sugar beet by expression of onion fructosyltransferase genes |journal=Plant Biotechnol J |year=2004 |volume=2 |pages=321–327 |doi=10.1111/j.1467-7652.2004.00074.x |pmid=17134393 |issue=4}}</ref> despite the still limited insight into the immunological mechanisms activated by such food supplementation.<ref>{{Cite journal |author=Peppelenbosch MP, Ferreira CV |title=Immunology of pre- and probiotic supplementation |journal=Br J Nutr. |year=2009 |volume=101 |pages=2–4 |pmid=18577301 |doi=10.1017/S0007114508020746 |issue=1}}</ref>