Carb loading, short for carbohydrate loading, is a nutrition strategy used by athletes, including runners, to increase exercise performance, particularly for endurance events lasting more than 90 minutes. It involves two major components: increasing the amount of carbohydrates consumed and decreasing the amount of exercise performed in the days leading up to the event. By increasing carbohydrate intake, the body is able to store more energy in the form of glycogen in the muscles, which can provide the stamina needed to sustain prolonged physical activity, such as long-distance running.

This process helps to delay fatigue and optimize performance by ensuring that the body's glycogen stores are maximized. The recommended carbohydrate intake during the carb-loading phase is typically between 8-12 grams per kilogram of body weight per day. Carbohydrate sources commonly used for carb loading include rice, bread, porridge, bagels, and other high-carbohydrate foods. Carbohydrate loading is not necessary for all types of physical activities, but it has been shown to be effective for endurance events that lead to large decreases in glycogen levels, such as prolonged running or biking.

Carbo-loading may improve performance by reducing fatigue and enhancing endurance, particularly for activities lasting more than 90 minutes. However, it is generally not considered effective for shorter durations of exercise or activities that involve weight training. Carbohydrate loading is a well-established and widely used nutritional tool to help athletes optimize their performance for endurance events.


  1. Timing: Start carbo-loading a few days before your race. During this time, you slightly decrease your exercise to allow your body to store more glycogen.
  2. Suitable for Long Events: This strategy is particularly beneficial for events lasting over 90 minutes, like marathons or triathlons.
  3. Carb Intake: Aim for 7-12 grams of carbohydrates per kilogram of body weight daily during this period. Include carb-rich foods like pasta, bread, rice, fruits, and vegetables in your diet.
  4. Balancing Macronutrients: Reduce intake of fats and proteins as they can slow down carb absorption.
  5. Not for Everyone: Carbo-loading may not suit every runner, especially those with diabetes or carb metabolism issues. Overdoing it can lead to stomach discomfort or other problems.
  6. Testing it Out: It’s a good idea to try carbo-loading during your training to see how your body reacts. Responses to carb intake can vary among runners.
  7. Consultation: Consider speaking with a healthcare professional or dietitian before making significant dietary changes.

In summary, carbo-loading involves eating more carbohydrates before a long-distance event to boost your energy reserves. It requires increasing carbs while tapering off exercise a few days before the event. Remember, this method may not suit every runner, so it's important to customize it to your specific health and dietary needs.


Some examples of easily digestible carbohydrates for carb-loading include:

  1. Grains: Pasta, rice, cereal, oatmeal, and bread are rich in carbohydrates and can be easily digested.
  2. Fruits: Bananas, pineapples, grapes, mangoes, and apples are examples of higher-carb fruits. Raisins and other dried fruits are also dense in carbohydrates, as is fruit juice.
  3. Starchy vegetables: Potatoes, sweet potatoes, and corn are high in carbohydrates and can be included in your carb-loading diet.
  4. Dairy products: Almond milk, rice milk, Greek yogurt, and cottage cheese provide a healthy dose of carbohydrates while also containing a high amount of protein.
  5. Baked goods: Pretzels, crackers, and baked goods like English muffins with jelly or honey can be easily digested and provide carbohydrates.
  6. Sports drinks and beverages: Fruit juice, chocolate milk, and energy drinks can help with carb-loading and can be consumed in the days leading up to the event.

Incorporating these easily digestible carbohydrates into your diet in the days leading up to a long-distance run or race can help optimize your performance by maximizing muscle glycogen stores.