Steer clear of foods high in fat (even the good kind of monounsaturated fat) like
avocados just before exercise. "Fats are very important and should be consumed at other intervals in the day, just try to limit your fat intake two hours before and after exercise," Metsovas says.
Foods with a lot of fat or fiber can be very difficult and slow to digest, and they remain in the stomach a long time. They also pull blood into the stomach to aid in digestion, which can cause cramping and discomfort.