There are several reasons for diarrhea when eating grapes: First, grapes are difficult to wash, but they must be washed clean. Cut the grapes into single pieces with scissors, put them in water and add some salt. Add some more flour, mix well and wash thoroughly, then rinse with water several times.

Another very important aspect is that you cannot drink water immediately after eating grapes. There must be a gap between eating grapes and drinking water. If you drink water immediately after eating grapes, it will cause diarrhea.