That's great you are joining your husband on his healthy diet! I bet it will really help having each other to keep on track. and then you maybe won't even need the simple carbs in the house to tempt you!
Yeah, it's amazing how fast my husband can lose weight. But he didn't get really off track like I did for big periods of his life, so maybe that is why it's easier for him? He also plays tennis really hard about once a week, so I am sure that helps, too.
I hope the change helps your son. Looking back, I moved after each of my major relationships ended, and that was great for me. I needed a new start and to not look back for a long while, and the new place felt like a new me and a new life. I hope he isn't moving too far away from you guys so you can still keep in touch and visit each other pretty often. To be honest, I can't imagine living far apart from my daughter, though the world is big, and that is a big possibility.
Anyway, hoping the change in diet and food solidarity with your husband really, really help!!!!