Can you change your body shape by changing your gut bacteria and can personality changes influence gut bacteria?

I have this theory that culture and personality can affect BMI just as much as food intake or lifestyle but I have not found any medical literature to support this beyond very light hints in this direction - the way I see it is this - have you ever met a movie watcher who is fat? Yes. Have you ever met a meditator who is obese? No.
Can you change your body shape by changing your gut bacteria and can personality changes influence gut bacteria?
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