Hey!
I would bet anything with a good balance of healthy (whole grain) carbs and protiens during the first stage of labor would be great. Just make sure it is a snack sized portion because you don't want a heavy meal since your body will soon be diverting it's energy and even blood supply to help delivery that baby. That doesn't mean that if you start labor right after a mean that you are in trouble. It just means you may have food sitting there a while and you could have a greater chance of throwing up during labor. It is not the end of the world!
My midwife recommends any juice during labor (but more importantly after a difficult labor), but especially likes orange juice for some reason. Pineapple and apple juice work fine,too. She also will give me saltine crackers with honey on them if I need some quick energy.
MOSTLY she will give me just pain water and make sure I am drinking plenty of it. If you feel low in energy, then by all means use something to get you the strength you need to keep going. Both you AND baby will need it!
Blessings,
Kim
mom of 9