Are they looking for a short cut to make it easier, that isn't there?
As a runner who has been in athletics a long time and runs most days I can tell you what works for me:
Pre run - just a drink of tap water, main thing is try to leave min 2 hrs after meal before training if you can - or you will probably feel sluggish.
After run - drink of tap water. Ocassionly after a long run and I feel knackered I will drink Lucozade Sport (this is flat Luc & more dilute than the normal) I add more water to it so that i'm taking in a bit of glucose and plenty of water. After a run get a meal inside you within an hour or so to restock your body.
Meal time now: carbohydrates (potatoes, pasta, rice, bread)
Protein: from lean meat: fish, chicken, don't really have much red meat.
Vitamins: Fresh fruit & veg (struggle with this)
Fat: You're probably taking in plenty already from all the processed foods, but some good quality lean ham is OK.
Beer: Good source of carbo - a couple of pints is good, but difficult to stop there!
Cut out the crap: crisps, biscuits, choc bars, fry ups, burgers, takeaways etc.
Get plenty of sleep.
OK, I don't follow the above religiously, but you get the idea. Sacrifices have to be made to get fit, there is no quick route.

