I'm not a doc, but I'm thinking that my creativity is based on my blood sugar levels.
I didn't eat anything until lunchtime yesterday and that's when I started writing.
This morning I had a chocolate Belvita biscuit for breakfast and wrote 1 chapter.
Just had Nutella sandwiches for me lunch and I'm ready to write another chapter now.
I've got a drinking chocolate too which will hopefully keep my blood sugar stable this afternoon, which, in theory, will mean I can keep writing... we shall see though! lol