Today January 25TH thin pencil poop. I have been having thin poop. diet; energy drinks milk cereal (rare if ever) Hamburger meat note used to eat pizza and rice as a part of my diet, cut out pizza and rice; now I am experiencing bowl problems. I went from big poops once a day to rarely pooping/ thin poop. second note thin poop when I have a stomach flu as well, something to note. third note I will add more carbs back into my diet to see what happens. Did research; pizza has things in it that lubercate the bowels.