In reply to The New NickB:
> (In reply to Loughan)
>
> You shouldn't really need anything for that kind of distance, but a banana might work or half a slice of toast.
Second this.
I've always run early morning for years and regularly would run 12km to work when I lived in London. The most I would have is a glass of water.
Now I live in the country and the terrain is a bit tougher, I sometimes find myself bonking a bit, so I make home-made energy bars (
http://chamoisbotherer.blogspot.fr/2012/09/home-made-energy-bars.html ). I grab one (or a banana) when I'm feeling particularly hungry, or I know its going to be a longer/tougher run and it helps.
I usually have my large meal of the day at about 7pm, so that probably helps. If you only have a light dinner and have something more substantial at lunchtime then you've obviously got less stored up*
The same with water - I never drink on a 60-90 minute morning run as experience tells me I'm not going to die if I don't and the hassle of carrying something is not worth it (plus in the morning its not too hot). I remember running with a friend who came to visit - she was just getting into running so we were going to do a gentle 5km, and she was horrified that I wasn't bringing a full bottle of water. I think we read too much 'advice' but don't listen to our bodies enough.
*completely unscientific and backed up by nothing but personal experience.