I don't find a problem with what you are doing. If you are working out and eating right most times it is ok to treat yourself sometimes. If you feel that guilty you might want to increase your workout. Instead of doing x amount of push ups you may want to add 5 more and say take that brownie. But you know you won't be just eating brownies and unhealthy sandwiches every month. Dont get too down when you pop something in your mouth that's not so healthy. The power is yours and you know that you can reverse your mistake. Its really nice to know your whole family eats healthy that should make it even easier. Good luck I think you will be just fine. and excercise. You do the math and tell me who's winning.