I dont think they themselves are full of hormones? But they might have been genetically modified not to have seeds if thats the concern? The argument of whether genetically modified foods are safe is a complicated one, most all processed foods contain genetically modified components... I think I heard that genetically modified foods have not been around long enough for us to know the true effects they are going to have on our health, but in general I think the consensus is to avoid them when possible.
I remember a story about how in the 1970s? They had this specific genetically modified corn created for feeding animals on the food lots or whatever, and it got mixed up with the corn meant for human consumption, people got really sick.... I'll try to look up a link.***
I dont know about grapes specifically ... they could have been just selectively bred too?
*** I found something about in 2000 an "allergy scare" that ended up with no cases search for "starlink" in this document http://science.nationalgeographic.co...w-altered.html