Do you need to eat during exercise?

Identifying factors that determine the appropriateness of consumption during exercise, is crucial in deciding if carbohydrate is needed for you.
1) Generally, the longer the event, the greater the amount of carbohydrate that is utilized. As a rule of thumb, if your sport or training is longer than an hour, you may benefit from consuming some carbohydrates during sport in addition to fluid.
2) Higher intensity exercise will burn more glycogen, or fuels stores more quickly during your game or session. So if your exercise session is roughly an hour and consists of predominantly high intensity work, then taking in some carbohydrate may be beneficial.
3) Temperature will also play a role, in that the hotter it is, the quicker glycogen will be used. However, in these situations, it is more likely that overheating and dehydration will be the limitation to performance
4) Pre-exercise eating has an impact on glycogen storage. The better ones pre-exercise meal is, the higher the stores of carbohydrate will be, and hence the more fuel that will be available for conversion during that event or session.