Editing Nutrient (section)

=== Non-essential ===
{{Main|Dietary fiber}}
Non-essential nutrients are substances within foods that can have a significant impact on health. [[Dietary fiber]] is not absorbed in the human digestive tract.<ref>{{Cite web|title=High-Fiber Diet - Colon & Rectal Surgery Associates|url=http://www.colonrectal.org/high_fiber.cfm|access-date=2020-08-16|website=www.colonrectal.org|archive-date=2020-09-26|archive-url=https://web.archive.org/web/20200926091147/http://colonrectal.org/high_fiber.cfm|url-status=dead}}</ref> [[Soluble fiber]] is metabolized to butyrate and other short-chain fatty acids by bacteria residing in the large intestine.<ref name="Butyrate synthesis pathways">{{cite journal | vauthors = Vital M, Howe AC, Tiedje JM | title = Revealing the bacterial butyrate synthesis pathways by analyzing (meta)genomic data | journal = mBio | volume = 5 | issue = 2 | pages = e00889 | date = April 2014 | pmid = 24757212 | pmc = 3994512 | doi = 10.1128/mBio.00889-14 }}</ref><ref name="lupton">{{cite journal | vauthors = Lupton JR | title = Microbial degradation products influence colon cancer risk: the butyrate controversy | journal = The Journal of Nutrition | volume = 134 | issue = 2 | pages = 479–82 | date = February 2004 | pmid = 14747692 | doi = 10.1093/jn/134.2.479 | doi-access = free }}</ref><ref name="Prebiotic digestion">{{cite journal | vauthors = Cummings JH, Macfarlane GT, Englyst HN | title = Prebiotic digestion and fermentation | journal = The American Journal of Clinical Nutrition | volume = 73 | issue = 2 Suppl | pages = 415S–420S | date = February 2001 | pmid = 11157351 | doi = 10.1093/ajcn/73.2.415s | doi-access = free }}</ref> Soluble fiber is marketed as serving a [[Prebiotic (nutrition)|prebiotic]] function with claims for promoting "healthy" intestinal bacteria.<ref>{{cite journal | vauthors = Brownawell AM, Caers W, Gibson GR, Kendall CW, Lewis KD, Ringel Y, Slavin JL | title = Prebiotics and the health benefits of fiber: current regulatory status, future research, and goals | journal = The Journal of Nutrition | volume = 142 | issue = 5 | pages = 962–74 | date = May 2012 | pmid = 22457389 | doi = 10.3945/jn.112.158147 | doi-access = free }}</ref>