I've subconsciously been putting this into practice probably, i.e., eating a 'clean diet', or foods that promote 'good' bacteria. I never talk about it, though, because it sounded very much like pseudoscience (until recently, I guess?). Just not enough samples or controlled groups for meaningful data to be interpreted. Strangely enough, I find this to be true for a lot of things in nutrition/diet.

Madonna is one of the biggest proponents of this diet who is famous: http://www.bloomberg.com/news/2012-05-08/madonna-s-secret-fo...

The article mentions probiotics, and so does the LA Times article, but there are also 'natural'/whole foods Madonna consumes, which are recommended by her nutritionist, who she works closely with.