For morning workouts, eating a bagel, cereal, toast or anything that consists mainly of carbohydrates is a good idea because carbohydrates give you needed fuel for your workout.
If you can, add some whole fruit and juice to your breakfast for an extra boost. If you do your workout during midday, a sandwich or pasta dish will fuel your body for exercise. If you need a little lift for late day exercise, try some crackers or fruit for a head start on your energy supply.
Depending on the size of your meal or snack, you should wait 15 to 20 minutes to let your body digest the food. In doing so, you allow your body to burn calories more efficiently