What does FOS mean?

Fructooligosaccharides (FOS) or Fructo-Oligosaccharides are low-calorie, alternative sweetener that occurs naturally in some plants. It is a form of water-soluble carbohydrate made mainly of fructose. FOS is used as an alternative sweetener in certain foods and even used as a medicine.
FOS compounds can be only partially digested by the human body, the undigested portion serves as food for friendly bacteria, and selectively promotes the growth of friendly bacteria in the gut. As FOS cannot be digested by the human body, so they have no effect on blood sugar levels. FOS seems to be safe when taken in less than 20 grams per day.

Note:
The term "OligoSaccharides" refers to a short chain of sugar molecules, "Oligo" means "few" and "Saccharides" means "sugars"

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