Cytokines/metabolism; Diet Therapy/methods; Dietary Fiber/pharmacology; Endotoxins/pharmacology; Illness Behavior; Interleukin-4/metabolism; Th2 Cells/metabolism; Animals; Antidiarrheals/pharmacology; Cytokines/genetics; Cytokines/immunology; Dietary Fiber/classification; Endotoxins/administration & dosage; Enzyme-Linked Immunosorbent Assay; Ileum/cytology; Ileum/drug effects; Ileum/immunology; Injections, Intraperitoneal; Interferon-gamma/metabolism; Interleukin 1 Receptor Antagonist Protein/metabolism; Interleukin-12/genetics; Interleukin-12/metabolism; Interleukin-1beta/metabolism; Interleukin-2/genetics; Interleukin-2/metabolism; Interleukin-4/deficiency; Interleukin-4/genetics; Interleukin-4/immunology; Interleukin-6/metabolism; Macrophages/drug effects; Macrophages/immunology; Macrophages/metabolism; Mice; Mice, Inbred C57BL; Mice, Knockout; Myeloid Differentiation Factor 88/deficiency; Myeloid Differentiation Factor 88/genetics; Pectins/pharmacology; Polymerase Chain Reaction; Spleen/cytology; Spleen/drug effects; Spleen/innervation; Th2 Cells/drug effects; Th2 Cells/immunology; Tumor Necrosis Factor-alpha/metabolism; Up-Regulation