My "go to" meal for people like this is boneless, skinless chicken breasts. I season with a salt free seasoning (Cavenders in the blue shaker or Mrs Dash are good ones). I either brush a nonstick skillet with a bit of olive oil or use a spray. I choose not to bake or broil them because it is just too darned easy to overcook them. Then a tossed salad with a choice of diet type dressings, some kind of green veggie. A half of a baked potato with some heart friendly margarine substitute or rice or couscous cooked in a healthy broth.
When I'm having several guests over and don't want to do the extreme healthy thing for everyone, I make sure that at least one side dish is good for them and that they can pretty much make a meal of it (I've cooked for diverticular, for vegan and vegetarian of other sorts, etc as part of a larger group. At some point you cannot cater to everyone's needs, just make sure to tell them what is in what dish. One of my funnier dinner moments was when a friend told me his daughter was a vegetarian. As usual, I made sure the sides would make for a good filling meal in and of themselves. She walked in and yelled "MEAT!! Yummy!" and chowed down. Several months later I entertained him with his OTHER daughter. It turned out he'd forgotten which of his gals was the vegetarian! They're both college girls and we all got a laugh out of it.