obesity really is a serious problem. this post offers a lot of helpful insights. i really try to get my younger cousins, neices, and nephews to get active and do some sports and not just sit around watching tv or playing xbox.
its great that you're walking whenever you can. make sure you really give ample time on brisk walking in a day. just keep being active. do something you like. any active sport. make sure to consult your doctor first though.