Everyone knows that we need to eat to survive and in order for our body to function and correctly and have energy we need to feed it what it needs. And when we say feed it what it needs that doesn't necessarily mean feed it what you happen to be in the mood for at the moment, especially if you plan on exercising afterwards or you are in the middle of your physical activity.
Another thing we all know is that mountain biking takes a lot of energy to do. Even if you are taking a shuttle to the top and riding down it still gets tiring and you need to make sure you have the proper energy or else you are asking for trouble, most likely in the form of a crash! And just because you stuffed your face before your ride doesn't mean it's going to be enough to get you by for the entire ride.
So what do you do to make sure you have the energy you need while out on the trail? The first thing is to plan for how long of a ride you are doing and its physical difficulty level as well as the weather conditions. And you definitely don't want to stuff your face too much right before the ride because then you will be getting cramps or some other kind of stomach ache related issue. And the same goes for liquids. Drinking a gallon of water before a ride won't make it so you don't have to drink on the trail and will probably just hurt you in the long run.