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Gut baceteria is 100% determined by your diet in the last few weeks, so realistically it's not about testing to see what works for you if you would prefer the otherwise healthier option (whole wheat), but rather about manipulating your gut bacteria to respond better to it, be it by removing dairy which fucks it up quite a bit, or artificial sweeteners, etc.
That's the ideal.

If you've some time could you cite me some publications discussing this in more detail. I haven't read enough discussing the turnover of the microbiome.

I'll try to scoop some up soon, just made a big article on milk and I'm all citation-ed out.
I'll try to find one tomorrow.

No rush, and thanks a lot! The microbiome is a topic I really would like to further my knowledge about.

And here I though it was because I'm fat.

Lol.

Each of our bodies are a bit different, from our biochemistry all the way to the composition of the bacteria in our guts. We are finding as research continues that these differences result in quite a bit of variability as to our own responses to foods/drugs/ etc. It's pretty interesting I think.

Thanks for reading!