No matter what the diet is, well-meaning friends can leave someone invited to a meal with literally nothing they can eat. A low-carb person would have a rough time in our vegetarian household, though if I knew, I could probably rustle up an omelet or something. However, I went to a dinner once where the menu was outlined for me in advance and it seemed like there would be plenty for me, but absolutely EVERYTHING except the dessert had BACON or another MEAT in it. Salad dressing (already on the salad), in the green beans, in the potatoes, and I was STARVING. The appetizers were sliced meat sausages between slices of cheese, so I couldn't even pick out the cheese, because the meat fat would make me sick. I can see somebody doing WW being left at a total loss for a compliant meal, with the heavy oil or cream salad dressing, already on the salad, which also contains meat and cheese, butter on those nice green beans, butter and sour cream and maybe cheese on those lovely potatoes, and the dessert, well, let us not go there. I don't think Friend is wrong for asking for some accommodation, like leaving the butter off the beans, the dressing off the salad, both served on the side, and having a plain potato set aside. Roasted vegetables are great for everybody -- we use a tiny spritz of oil, and herbs and they taste like luxury, yet would be WW friendly. I wouldn't at all mind setting aside portions with dressings and sauces on the side. I'd be a vegan if it weren't for butter and cheese, and we like sauces and spices.