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Whole foods like fruits, vegetables, and legumes remain the best source of prebiotics, and these beverages should be part of a broader, balanced approach to health.

And while you're thinking what you might put in the shopping trolley, the jury is still out on whether prebiotics and probiotics that change the good bacteria in your gut also benefit immunity.

Over at NBC News, integrative health expert Taz Bhatia likens bitter foods to prebiotics and how they impact the gut and microbiome overall.

Prebiotics are great for digestive issues, but they can also induce gaseousness and bloating.

Abdominal pain and diarrhea can also occur with high intakes of prebiotics.