Is it in my head or can 5/2 affect you immediately

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Started last week and fasted Tues/Thurs. Already crave sweet things less. Is that normal or in head. A non fast today and dh has cooked a yummy pasta bake. I would always have seconds but don't feel I need that today. All in my mind or can 5/2 work that quickly reprogramming body?

I think it can affect you immediately, it's amazing!!

Do you mind explaining the 5/2 as I'm interested :)
Don't you feel like you are going to pass out if you eat nothing?

Kate you want to get yourself along to the main 5 2 thread - there is a wealth of info in the OP (and past threads) and all the people on there are very helpful and supportive. They're up to thread no. 22 I think now....