You will mostly hear that the treats can cause side affects. From running to the restrooms, to causing you to stall. It is all an individul thing. No other way to learn but from trail and error. I dont think you should have more than one candybar a day. (However I have been known to eat far more than that in one sitting.)

Strawberries in the shake sound yummy.

Just pay attention to what your body is telling you, and you should be fine.