I think it's a wonderful that you have some goals in place and I think you'll enjoy going to school. You'll be surprised at how much that type of work has changed over the years.
As for your h's diet and lost weight and now he's gained it back...that's all part of the mlc script. They tend to diet very hard at the beginning because they want their teen bodies back and to catch the eyes of the women. Later on, as they progress through replay, they begin to settle down a bit and start eating again. My xh lost quite a bit and looked skinny as a rail, the smallest I had ever seen him early on in replay and then later on, he gained not only gained the weight back he had lost, but even more. The last time I saw him, he looked to be about 300+ pounds and looked like Baby Huey of the cartoons. Not good.
I don't see any harm in preparing some good home cooked meals that your h would enjoy. It gives them something to think about when they are away from home.
I do hope you have something nice planned for yourself today, i.e., even if it's just to rest.
Take care.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.