Catherine Collins, chief dietician at St George's Hospital, reported that after following Holford's advice to adopt a restricted diet, a young autistic girl participating in one of Holford's experiments suffered dramatic weight loss and sleep problems. Holford dismissed the allegations as "professional jealousy", stating that "This girl hasn't suffered. She's got better and is behaving better. Her parents are delighted with the results. It's only Catherine Collins who is not." Holford claimed that the girl was already a poor sleeper, and that when placed on a less restrictive diet, she was able to regain the weight she had lost.