My 12 year old son eats right, uses portion control, exercises all the time with sports year round, but continues to gain weight. why? what can be done

Make sure : He does not have hypothyroidism or diabetes . Have him get checked by pediatrician. Limit sweets. Watch his carbs consumption and feeding portions. Discuss w pcp.

Growth spurt weight: He may be eating before he undergoes a growth spurt at this age. It is quite common for that to happen around teen age time let him eat his nourishing meals.

Bmi?: Is this normal growth or accelerated obesity? Check his body mass index, follow it over a few months and see a pediatrician if there is a problem. http://pediatrics.about.com/cs/usefultools/l/bl_bmi_calc.htm http://www.Cdc.Gov/healthyweight/assessing/bmi/childrens_bmi/about_childrens_bmi.Html.