Carb Loading Diet

Carb Loading Diet: Marathon, Cycling, Running

It was in the 1960s when dietary carbohydrates were discovered as the major energy source to fuel exercise by being stored in the muscles as glycogen. Muscle glycogen content is linked to endurance performance and starting with lower concentrations results in premature fatigue, therefore nutritional strategies to increase muscle and liver glycogen before competition are common to maximize performance. Here we look at effective carbohydrate loading strategies to get the most from your carb loading diet and fuel your next event.

When to Start Eating Carb Loading Foods?

Sufficient muscle glycogen levels can be achieved from 24-48 hours of carbohydrate loading. Events lasting between 90 minutes and 3 hours require just 24 hours of loading, and then anything longer than that should be applied for 48 hours prior.

Right Amount for Carb Loading Meal Plan: Sample Diet

Again this will depend on the duration of the event, but training status should also be considered. For example, an elite Tour de France cyclist will consume on average 10-12g carbohydrate per kg body mass per day, but somebody running their first half marathon will not need this much. So for a 90-minute race, 6-8g per kg body mass of carbohydrate is adequate the day before. For nutrition for marathons and ultra-endurance events 8-10g·kg·bm is advised.

For example:

A 70kg athlete running a marathon will require at least 560g (8g·kg) carbohydrate. This is the equivalent of 9 large potatoes, 750g raw pasta, or 17 ½ 500ml bottles of Lucozade Sport.

Here’s a guide for how to plan your nutrition for a marathon race day.

Best Type of Carbohydrates for Carb Loading Diet

As you can see it’s a lot of carbohydrates that need to be eaten and eating that much pasta or potatoes is not recommended. It’s important to eat foods that can be better absorbed by the muscles and will not cause gastrointestinal discomfort. So, you need to learn about the best carb loading meal plan. Not all carbohydrates do this.

The glycaemic index (GI) determines the effect a certain food has on blood glucose with high-GI foods being broken down much quicker during digestion than low-GI foods, and are absorbed by the muscles more effectively.

Foods with a high glycaemic load (GL) have a greater quantity of carbohydrates for a given weight of food, and together with GI allow your muscles to efficiently obtain more carbohydrates. A large intake of fibrous (typically low-GI) foods can lead to gastrointestinal discomfort so it may also be wise to focus on simple, low fiber foods to alleviate digestive issues. White potatoes are high-GI and GL and removing the skins reduces the fiber content, making mashed potatoes an ideal choice when carb loading.

Before Marathon Carb Loading Diet

Typically breakfast, your pre-race meal should prioritize easy-to-digest carbohydrates with ample protein and plenty of fluids. This can be a personal preference, but a bowl of porridge with honey and banana is a good choice. Choosing lower-GI foods may be better in the hours before a race to help maintain satiety, and research also suggests that it may enhance performance compared to high-GI carbs.

Timing and quantities, again, are down to the individual, however, it would be practical to eat 1-4 hours before racing, containing 1-4g·kg carbohydrate (1g·kg·hour).

Foods To Avoid On A Carb Loading Meal Plan

As well as fiber there are other nutrients to limit…not only preventing unwanted digestive discomfort but also allowing for the increased calorie intake from carbohydrates alone. Dietary fat is very calorie-dense and should be significantly reduced, but protein should also be limited to approx. 1.2g·kg. Fat and protein can also slow down the digestion of carbohydrates therefore excessive intake can have a negative impact.

Other things to avoid include alcohol for obvious reasons, but also spicy food as this can cause major gut problems like bloating and wind which you do not want whilst racing! Excessive fructose (fruit sugar) may also cause flatulence, bloating, and pain and should be monitored closely if you have ever experienced such unexplained issues.

Gluten and lactose-containing foods may also be limited/removed from the diet for any individuals with specific intolerances, or if you don’t regularly consume them anyway, it’s better not to introduce them in large quantities just before the competition!

How To Carb Load Before Marathon Competition?

Hydration is fundamental during carb-loading because carbohydrates require water to get into the muscles. Drink plenty of fluids throughout the day especially with meals to aid absorption, but also to boost performance on race day.

It’s also important to note that any athlete should practice any nutritional strategy before applying them to a major competition. This is the same for carb-loading. Consuming foods that your body is not used to can have a negative effect. If you normally have porridge with skimmed milk before training, why would you choose a bowl of chocolate cereal with full-fat milk before a race? You wouldn’t. Stick to foods you know and have practiced with before in the days/hours before a race to prevent unexpected digestive complications.

Whether you’re used to consuming such high volumes of food or not, getting carbohydrates in liquid form is much easier on the stomach and promotes hydration, whether it’s an electrolyte drink or a smoothie.

Does carb loading really work?

Carbohydrate loading is a highly proven strategy in the days before the competition to maximize muscle glycogen stores and enhance performance.

Are potatoes good for carb-loading?

Potatoes are high in carbohydrates and many other key nutrients to support carbohydrate loading.

What athletes use carbohydrate loading?

Endurance and team sports lasting 90 minutes or longer will increase the number of carbohydrates they eat in the days before a race/game to ensure they are well fuelled to perform at their best.

What foods are easy for carb-loading?

Simple carbohydrates like white rice, pasta, potatoes, cereals, bread, oats, and fruits are all great options to support carbohydrate loading strategies.

What should I eat when carb-loading for a marathon?

Eating bigger portions of simple carbohydrates like white rice, pasta, potatoes, cereals, bread, oats, fruits, and fruit juices are great options to eat the days before a marathon.

Is carb loading good for running?

Carbohydrate loading is highly recommended the day before a running race e.g. marathon. However, it is not needed regularly before training.

How do you carb load before a run?

Increase the portions and frequency of carbohydrate foods in your diet the days before a race.

Does carb-loading cause water retention?

For every 1g of carbohydrates to be stored in the muscles as glycogen, it requires 3ml of water, so it’s important to drink lots of water when carb loading.

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