About 50 to 65 percent of starch and soluble sugar consumed is digested in the rumen. Rumen microorganisms (primarily bacteria) digest cellulose from plant cell walls, digest complex starch, synthesize protein from nonprotein nitrogen, and synthesize B vitamins and vitamin K. Gases produced in the rumen include carbon dioxide, methane, and hydrogen sulfide. The plant foods we suggest you should avoid are leaves, stems, roots, and seeds (nuts, grains, legumes). We believe that a strict carnivore or ketogenic diet can …