Exercise uses energy stored in muscles and fat
An increase in exercise (particularly cardiovascular exercise) expends a large amount of energy. This energy source is liberated from proteins stored in muscles, and carbohydrates and fats stored in adipose tissue. Many athletes will take a protein supplement after a workout to ensure that the muscles are replenished with protein to assist in muscle growth and repair and also to reduce any excessive lactic acid build up, tiredness, fatigue, microtrauma and muscle wasting.
Increasing carbohydrates in the diet is also important for maintaining weight when exercise and calorie burning are increased. To maintain weight, energy expenditure (exercise) must equal energy intake (food). Weight maintenance is about balancing these two factors. When this does not happen and our energy intake is lower than the energy we use, we have a decrease in body weight and vice verse. In your case it will be important to ensure that fat loss does not occur due to you consuming less carbohydrates in your diet in relation to your energy output. To maintain weight after heavy exercise you will need to consume mostly medium and high GI foods. A high GI (50+ value) food causes a rapid rise in blood glucose levels and is suitable for energy recovery after endurance exercise. Please show a little caution around your food choices because it is not advisable to increase the amount of refined sugar in your diet. Although you are requiring a higher GI (glycaemic index) value for foods taken after exercise, it is also important to maintain Low GI foods (less than 50) in your daily diet. Low GI foods will release glucose more slowly and steadily allowing you to maintain a suitable level of energy throughout the day.
Carbohydrate foods with their equivalent glycaemic index amount.