Yikes! I've got the opposite problem, indeed. My hubby -- who refuses to read the book on the diet we're following -- needs to be convinced of what he's allowed to eat. Then he'd argue that we shouldn't be eating certain things (like legumes, for instance) which are "allowed foods." I then tell him to read the book if he doesn't believe me. He's probably recalling our old diet which was far more restricted in what we were allowed to eat. I'm really unsure what his deal is with being so stubborn; I know his willpower far exceeds mine!
That's not "dorky"; that's fabulous! Hubster and I enjoy going shopping together as well. Not sure I'd trust mine with the menu planning though.

He does occasionally suggest things to me that I've cooked before that he'd like to have again (like the chili we can have).
Regarding the CPAP machine: Underlying medical issues aside, I can see (or is that hear?) first-hand how losing weight helps with snoring issues. I'm not sure I'll ever get back to not wearing earplugs at all, but being able to sleep in the same room as my hubby again -- after only a month of being back on a healthy eating plan -- speaks volumes.
Semi-unrelated: My dad, who has been severely overweight for probably the last 25-30 years or so, started dieting last year. He's been on a CPAP for the past 3 years, it helped him tremendously with his quality of sleep. He would nap after getting up in the morning, nap in the afternoon. He rarely does anymore. One of the best things that has happened for him since starting his diet, outside of the weight loss, is he was just taken off his high blood pressure medication and his diabetes medication -- the former he had been on for probably 30+ years and the latter he had been taking for the past 5 or so years. Tremendous testament to what losing weight can do for your health. I've very proud of him.
Not harsh, no worries. It's the "way of the internet"... "if you can't stand the heat, stay off the keyboard"

I'm actually just trying to understand exactly why he feels so adamant about certain things on the diet. As far as his willpower, he's got it in heaps; we never "cheat" and didn't the previous time we dieted (pre-kiddo). So, I'm not sure it's a matter of being tempted into doing something he doesn't want to do; and I've never intentionally tried to "sabotage" or force him into doing anything (unless it was to go on a Disney vacation)

Even with the birthday cake thing, I think it might be that he believes if he has one piece, all the hard work he's done will be for naught -- not that he'll go off on a binge -- like an irrational fear that all the weight he's lost will magically reappear if he has an indulgence on a special occasion. Although in addition to that, after mulling it over in my head, I'm starting to think his being stubborn stems from not completely understanding the diet and what we're allowed to eat and -- he refuses to read the book. *grumble* He keeps comparing it to the far stricter diet we used to be on, which is where a lot of our "diet bickering" comes from ("Yes, you CAN eat black beans!" "Yes, you CAN have a light yogurt.") All of it flies in the face of how he is in every other aspect of his life, very ... extremely logical. (He's a mathematician/researcher). So it puzzles me.
Love the man madly ... if he didn't drive me crazy every now and again, it just wouldn't be the same.
And yes, I've got annoying relatives who do just as you described, however it's not with food, it's "go ahead and have one more kid, you know you'd love to!" ...
I've noticed when I'm stressed about something -- like now it happens to be the end of my job contract -- the first thing that goes out the window is the motivation to do some exercise. Which frustrates more than anything as I know if I could get my butt down there and get moving, I'd feel much LESS stressed. *smack forehead* How does stress manifest itself in everyone elses' lives? Do you let the exercise go or do you cheat or do you cry or just run away?
Anyway, I've got to go make sure the kiddo hasn't burned down the front room or managed to wipe her daddy's PC clean.