Hey Stewart that’s an incredible achievement you’ve lost so much already! I don’t think ‘only’ losing 4lb is a big deal though that’s still a great loss, it’s not really realistic (in my opinion) to expect more than that.
I do think apples for breakfast and lunch possibly are not the best idea, 1 apple comes in at almost 20g of carbs and if you’re having 3 that’s 60g of carbs without counting whatever else you may eat. In addition you are not getting the input of protein and fat that is recommended.
In the book he says fruit should be adding taste and not the main event. I’d say maybe to switch to some berries and nuts for breakfast, have something better for lunch – if you like to keep it small maybe some boiled eggs, or I sometimes just have some cheese and cherry tomatoes.
However you’ve lost an incredible amount of weight by doing it your way – and it hasn’t stopped working. You may choose to just carry on π