I started drinking slim fast about a month ago. It helped curve my appetite and I was able to have a bowel movement 1 or 2 times a day. Slim fast shakes a full of fiber. I've been drinking it 2 to 3 times a day. On top of that, I also eat broccoli and celery which are also high fiber foods. Over the last few days I have been bloated and haven't been able to have a bowel movement. I keep gaining weight and not being able to lose any weight because I can't move my bowels. I was wondering if this is due to the slim fast and all of the fiber I am putting into my body.