For me breakfast was good and dinner but it was lunch that I had the hardest with. Carbs in everything. If you can find a beef patty, that would work. 2-3 burgers and then throw the bread. I was on Carnival a couple of times and dinners were the best as far as food quality and a sit down dinner but it's getting the quantity of low carb that's the problem because there are always potatoes, rice etc with the protein. Lunch and breakfasts are buffet and after you pass up tons of carb pasteries, bagles, etc, you should be able to fine some eggs and bacon. If I go again, I'll bring a few zip lock bags and stock up at breakfast to eat at lunchtime

Oh and cream for coffee, I never travel without my own.