All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.
There is no harm in eating any kind of grapes as they are pure and eating them does not cause any harm or drunkenness, it is only when it is squeezed and conserved until it has foams that it causes drunkenness, in which case it becomes forbidden to drink it, because it is intoxicating.
Finally, it should be noted that if there is a person who is harmed or becomes drunk just by eating grapes, then he [himself only] should be prevented from eating them as he is harmed by eating them, and this ruling applies to him only.
Allaah Knows best.