Mutualistic microorganisms in the gut are the most critical for the mammals that consume dairy and lactose containing foods.
Mutualistic microorganisms are those that live in the body of an organism and provide some kind of benefit to that organism. In return the organism provides the microorganism with shelter and food. For example, E. coli is the gut bacteria that helps in digestion of lactose in mammals.
Lactose is a carbohydrate. It is specifically a disaccharide formed through a bond between galactose and glucose subunits. It is found in milk and milk-related products such as cheese, cream, etc. Lactose is essential for the absorption of a few minerals like magnesium and zinc.
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