They get all confused. Their mathematical equations always balance out. But they forget that a pound of manure is not the same value as a pound of apples. Yet, if the scales balance, they will be satisfied eating manure and throwing good apples on the ground as fertilizer. But, then maybe it is all just a bunch of crap to them.
Some runners are the same way.
They ask how different runners train, what they eat, when they eat, etc. Their looking for some magic formula to make them better runners. The secret to running well is that there is no secret. Learn to run, and practice, learn what to eat that helps you feel strong and energetic, and have the willpower to recognize that indulging in crappy foods daily will destroy your health. Don't yeild to pressure to party or work too hard.