My poo has been VERY light lately, sometimes with a yellowish hue and other times with nearly white!, the paper would show more yellowish. This has been happening for at least the last several days, though I ve had one or two mid-brown stools or with some brown parts in them. I ran out of my heartburn mediacation so have been taking Calcium Carbonate Tums (about 1 ultra strength tablet every hour or two - sometimes more or less), and it would seem this is when I started to notice the color change. I am concerned though because my doctor has me on Simcor (which is a statin plus high dose niacin) which you have to monitor liver function over. I ve been on it over 3 months and hadn t been really paying attention to my stool color during that time. Also I recently had ESWL to break up a kidney stone. Just prior to my noticing this. Was on Flomax for a few days to help pass fragments, but I fainted after using it for 3 days and wound up in the ER, so the Dr. had me stop taking it. I ve been drinking A LOT more water lately too. To help pass the fragments and to help prevent future stones. I do take psylium fiber capsules with most meals and have for years mostly for more fiber in diet. I am due for a follow-up appt on the Simcor with blood-work to be done.