The blue poop method is a cheap way to measure your gut transit time. You don't really know how long it takes from the point that you eat to when it comes out the other side. It might be taking you two or three days, so I do think it's just this incredibly cheap do-it-yourself experiment. If you'd like to try Zoe's personalised nutrition program for yourself, get 10% off by going to joinzoe.com slash podcast.

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