Yes.  I have two SWCAH chilren, age 12 and 10.  The older one has the potential to be heavier, but she is extremely athletic and works it off.  My son has "battled" the weight issue for the past 2 years.  He too is active (not as much though), but he just seems to have a slower metabolism.  The endo suggested a somewhat modified low carb "diet" and it is working well.  He lost 6 pounds and grew too so he’s looking good and feels better.  It was so hard getting started, but I’m glad we did it.  Good Luck.

Michele