A healthy gut microbiome (the balance and amount of microorganisms in the gut) dramatically impacts overall health. (ultrawellnesscenter.com)
Fasting, while drinking water and other cleansing beverages, will flush out the digestive system and reduces the number of natural microorganisms in the gut. (naturalhealth365.com)
For the most part, vitamins are acquired when food is ingested, but some are acquired by other means: for example, microorganisms in the gut flora produce vitamin K and biotin; and one form of vitamin D is synthesized in skin cells when they are exposed to a certain wavelength of ultraviolet light present in sunlight. (en.wikipedia.org)