You do not have to train and exercise on an empty stomach, but also you need to be careful what type of food will enter in the body before and after exercise. To be the workout more successful, you need to be careful.
If you exercise early in the morning, it is the best to eat in the period of 30 minutes after waking to immediately speed up the metabolism. The combination of oatmeal with banana is an excellent choice because it will give the body enough energy, and you can practice without problems and nausea.
If you prefer to exercise in the afternoon, eat something easier like an apple or a milk meal. Once you finish exercising, it is the best to feed the body 30 minutes after exercise to burn more.
White meat, almonds and protein shakes are always a good option.
Do not forget to drink water while exercising.