Eat foods that are natural sources of energy. Complex cards, such as pasta, will give you energy to help keep you active.
Avoid foods that are fatty, such as junk food or fast food, they will just make you tired and sluggish!
Sugary foods will give you a quick boost, but once that wears off you'll be extremely tired afterwords.
It's best to eat a well-balanced diet. Don't forget to drink lots of water!
Exercise daily, even if that means going for a 15-minute walk twice a day. At least 30 minutes of exercise every day will help keep you healthy, active, and alert.
Lastly, get enough sleep! If you're well rested to begin with you won't have to worry as much about being tired later.