Definitely does here! I wouldn't say my DS is intolerant to grapes but they do give him diarrhea! When he was about 12-18 months old the most I would have ever let him have is 2-3 in one day. He can handle a few more now, but maybe 5-6 in one day is more than enough. I quarter them so that he feels he has more, and they last him a bit longer. If I gave him 10-12 grapes in one day, he would have diarrhea for 2-3 days, for sure!!!