“They found that both fructose and glucose, which together form sucrose, block the production of a key protein called Roc, which is required for colonization of this beneficial bacterium in the gut.”
Read more here.
Paper: https://www.pnas.org/doi/10.1073/pnas.1813780115
G.E. Townsend, W. Han, N.D. Schwalm, V. Raghavan, N.A. Barry, A.L. Goodman, E.A. Groisman, Dietary sugar silences a colonization factor in a mammalian gut symbiont, Proc. Natl. Acad. Sci. U.S.A.
116 (1) 233-238,
https://doi.org/10.1073/pnas.1813780115 (2019).