I totally feel your "parent of a teenager" pain
It's SO tough!
I went for coffee with a friend the other day and I was talking about my teenager problems. She was sympathizing and said she was worried that it was my teenager angst that was "causing" my weight loss and she was worried about me
I told her if I was allowing him to influence my weight, I would likely weigh 400 pounds by now!! Clearly, I do NOT have a history of NOT eating when stressed
For you to stop at one measly Twix bar is awesome! Don't beat yourself up and keep on doing what you've been doing.