The context of the following conversation is Jan was very overweight and due to medical issues her doctor advised her she needed to cut back on her food intake.:
Jan says My doctor told me I'm going to have to go on a diet..
The friend responds If that was your doctor's advice, it must be for health reasons..
Jan responds I've been gaining a lot of weight lately and my doctor think it's bad for my heart..
The friend responds I've put on a few pounds myself these last few months, so maybe we can diet together..
Jan responds That's a great idea. I'd love to..