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As a partial counter-point, you should be aware that diarrhea is a very common symptom for the first several weeks when one changes their diet substantially. Drinking more water, eating foods that are easier to digest, ingesting more vegetables -- all these things trigger your body to flush itself.

For most people what looks to be a diarrhea in reality is a mildly violent reaction to the changes of your feeding habits and thus the changes in your metabolism. In rarer cases, I've known people consuming Herbalife who, even though they admit they feel MUCH better, occasionally puke -- that's the rarer form of the body flushing itself.

So this seeming diarrhea is very normal in the first phases of weight loss -- or even simply starting eating healthier and ingesting more water without aiming for a weight loss.