Absorbing essential compounds
Bacteria make it easier
Together with making food more available for the host, bacteria can synthesize some vitamins (vitamin K, biotin, folate, vitamins of B group) and other essential compounds. Bacteria make it easier for the animals to absorb calcium, magnesium, iron and possible other microelements from feeding.
Body control
Gut bacteria can change some programmes in its host and force the body to store more nutrients. For example, some bacteria can switch off the system, which regulates fat production in animals. In this case, from the same amount of food, an animal body can produce up to 60 % more fat!
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