All you gotta do is make the meals low fat and add your fat afterward. A nice healthy piece of salmon won't hurt anybody on any diet. A nice potato won't hurt anybody. You can put butter and sour cream on yours. They can put smart beat or whatever abomination on theirs. You can even make yours a sweet potato and let them have white potatoes if that's the way you roll. A nice pile of cooked greens or any kind of steamed veggie is good for everybody. You can slather yours with butter and bacon grease. Chicken with the skin on tastes great. They can peel the skin off and give it to you. Any dish served over rice or pasta can be served over zucchini or sweet potatoes on your plate. I'm a big fan of burrito bowls. Let them have all the tortillas. Most people like eggs for breakfast. Maybe your wife will like an egg white omelet and you can get extra yolks for your own. And if steak or pork chops is ever an issue, well then, you get steak and everybody else can have a reheated frozen dinner. You get the idea.
Female, 5'3", 49, Starting weight: 163lbs. Current weight: 135 (more or less).
Starting squat: 45lbs. Heaviest squat: 180 x 2. Heaviest Deadlift: 230 x 2