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FOS (Fruto-Oligo Saccharides)
A form of carbohydrate that has become increasingly popular as a supplement. This is because it's been found to have a great beneficial effect on the intestinal flora - FOS actually feed selectively only on the friendly intestinal bacteria, such as Bifidobacteria and Lactobacillus acidophilus, but not the unfriendly bacteria such as Clostridium perfringens, salmonella or E coli. In one study, a daily addition of 8g FOS to the diet, resulted in a ten-fold increase of the friendly Bifidobacteria.
The use of FOS is particularly important when taking antibiotics, which kill all intestinal bacteria - good and bad, allowing the body to be generally run down.
FOS's occur naturally, but in small amounts, in such items as artichokes, bananas, garlic, grains, onions and tomatoes.