Are you carbo-loading enough beforehand?
Err, no. I'm off soon to do 50 miles (if I can sort a route). This will take me a lot longer than 2-3 hours as I'm not very fit and am still in a self imposed big ring ban. I have just fitted a second bottle cage to the bike as I have been getting headaches the next day. This is despite drinking before, during and especially after. So I started to think and one of the theoies I came up with is lack of available protein. It generally is a while before I can get cooking (sorting out kids, waiting for bird to get home etc.) I really should try breakfast I suppose.
I will try a large bottle of water, on of Rock's squash and a couple of bananas today and report back.
Today's mood... Middling, middling to poor.