 [ Symptoms ] what is a “caf nap” [ Disease ] protein diets do not cause weight gain and may even cause weight loss most important is following your son is appetite kids on adhd meds tend to be hungriest in the morning and dinnertime when the effects of mediation have worn off    take advantage of these times your best bet is to see a pediatric dietitian they will track your son is growth and can provide diet recommendations to keep his weight and growth on track they understand the effects of different medications do not delay getting help see adhd drugs and growth