I have been to Jamaica many times. Never to an all inclusive. I have had zero issues. Once the staff understands what you mean, you are all set. There is some confusion because they use rice flour, corn masa and that funny one, casava. So saying "flour', sometimes doesn't work and saying "wheat flour" sometimes doesn't work because they sometimes don't understand whole wheat, white flour anything made from the wheat plant. You will never meet a group of people more wanting to acomadate your needs. Don't be afraid to leave the walls of Sandals. Go find a jerk shack and enjoy. Get some lobster from the guy who walks the beach selling lobster. Make friends with the fruit lady who brings the fruit on her head. And by all means, do not be afraid of the juice sold in the recycled rum bottles. Your taste buds are going to be happy and your belly too.