I'd agree, I was having the same problems, but now have a snack at the turn and cured the problemI know many people on another thread have said its nonsense. But keeping energy levels up is very important. To do that the body needs fuel. And it needs to be in the form of food and drink that releases energy quickly. There is no point eating something on tbe 10th tee that will take 2 hours to digest and release energy.
Sugar and quick releases carbs are your friend.