Reishi Mushroom Polysaccharides may Improve Gut Flora

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Concerning the possible mechanism of action of polysaccharides from a water extract of Ganoderma lucidum mycelium (WEGL), previous studies suggest that intestinal bacteria possess distinct polysaccharide preferences and that these molecules may favour the growth of specific bacterial species in the gut microbiota. Collectively, our results suggest that both WEGL and its high molecular weight polysaccharides may be used as prebiotics to reduce body weight gain, chronic inflammation and insulin resistance in obese individual.

From the study: Ganoderma lucidum reduces obesity in mice by modulating the composition of the gut microbiota

Not that we really needed another reason to praise Reishi, but we got one anyway.  Of course this was an animal-model study and further research in humans is warranted.