First of all, fat is fuel for your body. You need it to keep you going during physical activity and to keep your blood sugar steady. Eating a carb snack that is low fat will cause a blood sugar spike and drop even if it just whole grains. The added sugars are what you might want to resuce not include at all in a truly healthy recipe.
I would recommend using coconut oil as the fat because it is a very good fat for you. Instead of sugar, include raisins or some other chopped dried fruit as they are more natural, unrefined sweets.