### Human:\nbowel movements r fatty slimy and greasy and float. yuck. ! blood wk for celiac disease negative. can you help?\n\n### Assistant: so first i was wondering if this might have something to do with your diet because i remember this was a side effect of 1) eating olestra (fat free chips) and 2) some of the weight loss medications. then i looked to see why this happens and the explanation was malabsorption. here is an older article on olestra but it gave me lots of good information. hope this helps!