Kefir packs less of a probiotic punch than labels claim

(University of Illinois College of Agricultural, Consumer and Environmental Sciences) Gut health is having a moment, with sales of fermented foods such as kefir, kombucha, and kimchi steadily on the rise. The benefits of "good bacteria" in fermented foods and supplements go well beyond the gut, moderating immune responses, heart health, weight, and even mood. But do products hold up to the claims on their labels?