Yes, absolutely. Although food cravings are a "dead giveaway," those who have them are not the only kids who respond to the diet. Other big clues are GI problems like diarrhea or constipation, good and bad days, pain insensitivity, frequent screaming, and sleep disturbances. However, if your child does not meet these criteria, he still may have a surprising response.
Sometimes we feel that parents are hoping we'll tell them that their child doesn't need to be on this diet. Isn't that sad? This would mean that there is nothing they can do for the child besides therapy. However, we estimate that at least 30% of autistic children do respond to the diet. These are good enough odds to do the work involved.