The doctor explains how food that is not used for energy is turned into body fat, and that it is much easier to prevent fatness than to slim down. She also explains calories and the right way to cut down food intake. The doctor gives Mrs Grant a diet sheet, explaining what foods Jimmy should eat and what foods he should cut down on. As Mrs Grant and Jimmy leave the doctor's, Mrs Brown and Ronnie are going in. Mrs Brown however, does not cooperate with the doctor and refuses to put Ronnie on a diet, saying that her family are fat people and that is all there is to it. Jimmy however, with the help of his mother, begins to lose weight and do better in sports. The doctor says to the camera that to cure a fat child is not a simple matter, and that the child, parents and doctor all need to work together.