>>>The physical appearance of your bowel movements can already reveal a lot about your body’s digestive health, and color changes can even indicate more severe problems. But scientists at Rice University want to make it even easier to spot medical problems in your colon, by tinting your poop a rainbow of different colors
It's hard to know now if such diagnostic reactions, and vectors that produce them shall be inert to a biome. So the above statement misrepresents the risk.
If it ain't broken... Why does it need to be easier? Biome is important. Don't mess with it.
This technology is probably not for me. But you're welcome to make your poo rainbow if you want to take that risk.