Author contributions
PD
RECRUITMENT
D.A.H.: study design, patient recruitment, patient assessment, data analysis/interpretation, and wrote the first draft of the manuscript; R.M.V.: conceptualization of the hypothesis and study, study design, data analysis, data interpretation, wrote, reviewed, and edited the manuscript, and revisions of the manuscript; T.M.C.J.: conceptualization of the prebiotic mixture, performed fermentation studies, performed stool SCFA measurements, data analysis and interpretation of the fermentation studies, review, and edit of the manuscript; B.H.: conceptualization of the prebiotic mixture, supervised fermentation studies, data analysis and interpretation of the fermentation studies, and review and edit of the manuscript; P.A.E.: processed biological samples, stored biological samples in repository, performed supervised microbiome interrogation, microbiome data analysis and interpretation, and review and edit of the manuscript; M.S.: supervised blood-based laboratory measurements, data analysis of blood-based laboratory measures, and review and edit of the manuscript; S.R.: performed blood-based laboratory measurements, data analysis of blood-based laboratory measures, and review and edit of the manuscript; T.C.: performed fermentation of PD stool with different fiber types, and review and edit of the manuscript; S.J.G.: supervised microbiome interrogation, microbiome data analysis and interpretation, conceptualization of the prebiotic bar, and review and edit of the manuscript; A.N.: performed microbiome bioinformatics analysis, review and edit of the manuscript; C.B.F.: study design, data analysis/interpretation, and review and edit of the manuscript; R.M.: data analysis/interpretation, and review and edit of the manuscript; B.O.: statistical analysis and review and edit of the manuscript; H.E.R.: conceptualization of the prebiotic bar, dietary analysis, and review and edit of the manuscript; S.S.: conceptualization of the prebiotic bar and review and edit of the manuscript; C.G.G.: study design, patient recruitment, patient assessment, data analysis/interpretation, and review and edit of the manuscript; A.K.: conceptualization of the hypothesis and the study, cowrote the first draft of the manuscript, conceptualization of the prebiotic mixture and the prebiotic bar; study design, data interpretation, and review and edit of the manuscript.