Eat a meal 1 to 2 hours before you workout. One of the largest causes of workout sickness is low blood sugar. The best prevention is to ensure that you eat a meal of at least 300 calories, which includes protein and carbohydrates. -- If it is not possible, then eat a small carbohydrate-based snack and drink a protein shake after your workout. Carbohydrates are the fuel that is used during aerobic activity. Protein helps to rebuild the muscles after your workout.