I'm one of those who is heavy and so is my SO. He also has a complex set of medical problems, and weight loss would help with a lot of them. He resolves to "start tomorrow" or Monday, or whatever, and then lasts a matter of hours. He's frustrated...in younger days he did the Iron Man triathlon and was fit/strong, but between time and the medical issues it's a lot harder for him to be active now.
I couldn't keep waiting for him to be ready and couldn't keep making my own excuses; I really need to get this weight off and resolved to do it with or without him. I have been working on it steadily. I've been doing quite a bit of the cooking (he's actually a better cook than I), and eating plenty, and the meals have been good. I'm losing weight. I'm not craving and therefore able to say "no" to the things that I cannot have (ever, i think, as bad carbs and sweets turn me into a ravening monster with insatiable appetite and limitless capacity) and be healthy. All told, I'm doing well.
He's watching, though...commented last weekend on my dedication...and then noted that he thinks he's lost a notch on his belt. Then today we had an email exchange from work about dinner, discussing healthy/balanced meal, and he was telling me how he was staying away from the baked goods at work.
It feels something like an undeclared war, but I'm pretty happy for both of us.