Grapes can be used in the treatment of constipation, which is to say that they can cause diarrhea if they are consumed in large quantities.

It is important to thoroughly wash the grapes you pick up from the grocery store, as they can carry with them a number of pesticides and harmful chemicals which can lead to all sorts of health problems if ingested.

Those who are having problems with constipation will certainly want to eat as many grapes as possible. Organic grapes are always better because you will benefit from them more in terms of overall nutrition and the vitamins/nutrients you get.