Lesley - it is ALL carbohydrates which increase our blood glucose - not only the sweet tasting ones - sugar itself is merely another carbohydrate. Hence sugar (and fruit of course has sugar in it in the form of fructose - but your body couldn't care less what type of sugar it is - it still increases your BG) flour (so anything containing flour eg pastry bread cake etc) rice (whether long, medium or long grain) potatoes (every single type) - are the first list of things to cut down on, cos they contain the highest proportion of carbohydrate.
You'll probably see stuff telling you oh bread's OK and so is rice, as long as you eat brown bread and brown rice. Well is isn't necessarily so at all, it's not that simple unfortunately! How much of each thing that each of us can manage to eat - will be different - and the absolutely only way to discover what's good or bad for YOU personally to eat - will be your meter results gleaned from testing before and after you eat X amount of that thing and seeing what happens.
Years ago there was an advert for eggs on TV - the slogan was 'Go to work on an egg' - and it's still true - you'll have more energy and remain feeling full for far far longer after eating an egg than from eating a bowl of cereal (whatever cereal it is, including porridge) or toast for your brekkie. The same applies to any protein, at any time of day. (fish, meat, eggs, cheese - there's also protein in 'legumes' like peas and beans BUT they also have carb in them, so care is needed)
Butter on the toast does slow down it's digestion and thus the speed at which the carb reaches your bloodstream (by which time the body has converted it to glucose) and that's the same thing with 'brown' varieties of flour, rice etc. It just slows it down so the release of that carb/glucose doesn't happen so quickly which helps somewhat for anyone still producing their own insulin, which you should be at this stage. However you would still most likely have to cut down the actual amount of it, since the carbohydrate is still there - it hasn't magically disappeared by just keeping its overcoat on! (a bit like a toddler pretending not to be there - by hiding under the bedclothes LOL)
So protein won't affect your BG and neither will fats or green veg inc cauliflower - whatever you have with them is a matter of choice and testing.
Good luck!