Fast weight gain in fast growing children

Any kind of diet for a child has to be supervised by a pediatrician. However, gaining weight fast is not unusual for fast growing kids and for any person whose diet limitations were canceled. The first thing to do is to figure out what kind of weight is gained - fat or so called lean body mass, which is mostly muscles and bones. A possible reason is water retention, which also calls for your doctor's attention. The usual suspects, if there's no kidney or heart problem, are junk foods, salty and spicy foods - they are never appropriate for children.