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[–] ougNaHadNepVed [S] ago  (edited ago)

The form of fiber they found effective was inulin. Appears to be common in plants. Supplements are derived from chicory root. Foods are asparagus, onion, garlic, bananas, barley, rye, wheat.

edit: Here's a link to a website I found that lists 19 common foods (some of them don't seem so common to me).https://www.healthline.com/nutrition/19-best-prebiotic-foods