Recent study shows that walnuts increase the diversity of gut bacteria and appear to act in much the same manner as prebiotcs.
Research Associate Professor of Physiology at LSU, Lauri Byerley, has determined the consumption of walnuts alters the composition of bacteria within the gut. This finding suggests a new manner in which walnuts might improve human health. The details of the finding were recently published online in The Journal of Nutritional Biochemistry.

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