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Michigan Medicine researchers found that from 2009-2023, the consumption of probiotic supplements increased 786% among young people. In that same span, however, people did not eat substantially more high-microbial content and high-fiber foods, such as whole fruits and vegetables. Experts are encouraging people concerned about their microbiome to consider their diet before relying on a supplement alone. “A diet with plenty of vegetables, fruits, legumes, and whole grains provides not just fiber, but also a wealth of other beneficial vitamins, minerals and plant-derived compounds,” Newman said. “This helps support a diverse and range of beneficial gut microbes. Prebiotic supplements alone do not contain the same variety or richness. It’s like picking one color out of a rainbow.”