How can probiotics help relieve symptoms of anxiety and depression?

In a randomized, double-blind, placebo-controlled study of 39 patients with chronic fatigue syndrome, probiotic Lactobacillus casei strain Shirota was found to significantly decrease anxiety symptoms. Probiotics (bifidobacteria is one example) have also been shown as an effective alternative treatment for depression because of their power to inhibit inflammatory molecules called cytokines, decrease oxidative stress, and correct the overgrowth of unwanted bacteria that prevents optimal nutrient absorption in the intestines.

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