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The specific type of probiotic bacteria was bifidobacterium and it decreases with age. One of the ways it regulates the immune system is by generating metabolic products that increase natural killer T cells, a specific type of immune cell that kills cancer cells. Bifidobacterium needs to be fed a wide variety of fiber in order to produce these signaling molecules (such as short chain fatty acids and others) that in turn regulate the immune system.

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