Hey guys...I have been on diet since Monday and just been having salad, chicken, cornflakes...yesterday at work we had treats in afternoon...I had a mini cookie and mini brownie...straight away after I had such a bad tummy...can bad food go straight through you that fast? I suffer with a bad tummy on and off and have had tests before which resulted in them finding that I was low in iron...I often wonder if I could be a case of ibs?! Anyone had similar problems?