I watch carbs and count calories (or at least make sure I am aware of them) and work out regularly at a gym. I lift weights at least twice a week, and do cardio workouts (run 3 miles or take a 45 minute "spin" class) three times a week. I avoid sugar, so no candy, cookies, ice cream or cake-- unless it's a special birthday~
Try switching from white potatoes to sweet potatoes. They taste better and have a lower glycemic index.