Orlistat
"Have been on these for 3 days.  Having really bad oily anal discharge but can only assume it's because I ate chocolate birthday cake last night. I'm too scared to eat anything fatty now. I can't risk this happening at work or on the train!  I was on these before a few years ago and they didn't do anything for me. Hopefully they'll work this time as I'm a lot heavier than I was then."