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Many years ago I learned about Japanese doctor Shinya. He pioneered the colonoscopy an found that diet was a big factor in intestinal health.

Here some videos (may be NSFW):

https://www.youtube.com/watch?v=B1LREA1ZuUE

But there are lots more to see.

I believe what he discovered is important. Not that I believe his advice to drink ionized water (Kangen water) is scientifically sound. But that does not matter for the discovery that switching to eat rice and veggies cleans your intestine.