How strange Andy - exactly the same thing happened to me on RTM!
I had never liked raw apples before and I became obsessed with them. I used to take a bag of apples to work every day.
I came to the conclusion that it was a combination of liking the fructose, natural sugar and knowing that they were supposed to be good for me.
I still eat loads of apples, Braeburn are my favourite raw and Bramley's cooked. Lucky I have a Bramley tree in my garden so it's apple with everything at the moment.
Yum Yum. You could do a lot worse.