I am 22 years old. I haven t travels or tried any new foods. Since last Tuesday I have had constant diarrhea. Whenever I eat anything it comes out in the form of diarrhea within 30 minutes. It doesn t even digest in my system - I could pick it up and eat it again cause everything is whole and undigested. The nurse at my family doctors office told me to go on a bread rice and water only diet for 72hrs or u til it is out of my system and not to take any sort of pills like gravol or imodium so it can clear my system. On Monday I had mashed potatoes and french toast cause I thought it was out of my system cause I was having poop not diarrhea finally. But within 20 minutes I had diarrhea again that lasted over 3 hours. I am now back on bread rice and water only and still having diarrhea.