prebiotics

noun

natural substances in some foods that encourage the growth of healthy bacteria in the gut

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for prebiotics

Contemporary Examples of prebiotics

The bacteria in your colon thrive on nondigestible fiber, also known as prebiotics.
How to Choose the Right Probiotic for You
DailyBurn
May 16, 2014