I would second the hard-boiled eggs, as boring as they may be I find that if I have two large boiled eggs for breakfast, they really do keep me going far longer than a plate of Bacon and Eggs.. very odd I know.

They are also low on the calorie front, to help you with that as well.

I find myself having to try and watch calories a bit as well, so where possible use low-fat stuff that has "minimal" difference in carbs, ie half-fat creme fraiche or double cream. Very little difference in carb levels. Half-fat cheese, no difference!! But mayonnaise and stuff like that is a BIG difference, as it has been stuffed with sugar to replace the fat - they are the big no no type alternatives that still need to be kept clear of.