I’ve read so many things on this subject and I’m still no nearer to understanding it!
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humans live in a relationship with the bacteria in / on our bodies. Some bacteria make people sick. The friendly bacteria, on the other hand, help you break down the food you eat so you can use the nutrients to grow and repair your body’s tissues, including the immune system. The friendly bacteria also help to fight the unfriendly kind.
you can see what happens when friendly bacteria are not there, for example, in people living with untreated HIV whose friendly bacteria have been wiped out. Or cancer patients. They can’t eat well and they can’t put on weight.
tl;Dr: you need friendly bacteria to feed your body.
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