Originally Posted by TallHeavyAndSkinny

Not just protein - if you are pooing alot it can mean your body isn't using up all the nutrients you are feeding it (Protein/Carbs/Fat) or that it just doesn't like what you are feeding it.

There are a number of other explainations which are medical related.

Just check against your food log to see what you've eaten vs how many bowel movements you've had and see what correlates.