Regardless of what level you're playing at; an important aspect of being an athlete is maintaining a healthy diet. This is not only for game days, but every day.
But What About Game Days?
You need energy to play the up tempo game that basketball demand from you. Carbohydrates are your energy giving foods. So, a meal with high amount of carbohydrates should be consumed about 2 - 3 hours before the game. We need to give your body the time to digest it properly and convert those carbohydrates into sugar, which is where our energy will come from. You should always eat to satisfy your hunger, but never overeat or stuff yourself. If its a snack, then you can have it upto an hour before the game.
Pasta is a favourite among athletes as Lunch and Dinner choices.
As for snacks, there's an infinite number, such as, cereals, vegetables, crackers, peanut butter sandwiches, pancakes, French toast, Bagels, apples, bananas, grapes, orange juice etc.
Try and avoid dairy products if possible. Low fat yoghurt is okay though. Make sure you are well hydrated before your game. Remember to continue to hydrate during and immediately after the game as well.
If your practice or games are late in the afternoon, make sure you eat a good breakfast and lunch that day. Fruits like bananas or grapes an hour before the game would also be a good boost.