For rides under 40 miles, I don't eat any different than I would any other day. I do make sure to have something with protein in it when I get back though. I usually just drink water on short rides, anything over 40 and I will grab something with electrolytes and usually eat something with protein and carbs before I leave like a whole wheat english muffin and an egg and maybe a banana.

Everyone is different though and you will need to find what works for you.