Hi Sue.Q I don't think it's a question of doing it too soon, for me it's more a question of balance, no point in upping your saturated fats if you are not prepared to reduce, say, carbs. Ying and yang, but not easy. I've been at this 5:2 lark now for some 18months and I'm still tweaking away like a demented weaker, but I feel that I may have at last found my own personal holy grail, it has been a long, slow journey and sometimes along the way I almost gave up and just went back to stuffing my face from sun up to sun set. I'm glad, though that I stayed with it and although I am now in a very comfortable place, I call size 8 jeans very comfortable, I am aware that I can never be complacent and think 'well, that's done' because it is never done, it is a permenant work in progress but a pleasant one but still easy to lose ones way.
You are doing SO well, so why not just carry on and gradually introduce some subtle but significant changes, in stead of say, fruit crumble with custard, I know, I know, have blueberries with cream? Instead of cereal for breakfast sometimes have bacon and eggs, or berries on porridge rather than sugar. All these things can make a huge difference over time but really the secret is to eat what you enjoy, WITHIN REASON, just rearrange things. Good luck, not that you need it as you are doing fantastically without any input from me,
Ballerina x