Food additives, gut microbiota, and IBD. Abbreviations: CMC, carboxymethyl cellulose; E-171, titanium dioxide; E-950, acesulfame potassium; E-951, aspartame; E-954, saccharin; E-955, sucralose, E-961, neotame; IBD, inflammatory bowel disease; P80, polysorbate 80.