I started with chicken and leaves and broccoli exactly as the book said. I also tried tofu in stir fries and made my way through the entire repertoire of Quorn (I absolutely love the sausages). I've eaten most kinds of fish & also really love prawns.
However after a few weeks and once I was safely in ketosis I have started to experiment with a few items that are not on the Cambridge list. I understand that the list exists because some people are extremely sensitive to carbs and even small amounts will tip them out of ketosis, but I figured I wouldn't know unless I tried & thankfully I find I have a reasonably high threshold & stay in most of the time.
So i have extended my vegetable selection to include occasional carrots, parsnips, sweetcorn, pease etc. because I love them so much. I have a serving of one of these veg off the list every couple of days. And I have extended my protein selection to include eggs occasionally (I really love omelettes!) and also the very occasional piece of really lean steak which I adore. I've also thrown the occasional handful of nuts & seeds into my salads & stir frys.
I'm not having any starchy stuff - no bread, potatoes or pasta, and no sugary stuff, including fruit.
I guess I'm just the kind of person who always kicks back at any rules that are imposed on me. This is why so many diets I've tried have failed in the past - tell me I can't have something and I have to try it just to prove you wrong. But thankfully this time, I'm managing to have a few treats and yet continue to lose weight. This plan rocks.