Dominic Stone
Carbohydrates are an important source of energy and are essential for brain and muscle function. Carbohydrates are stored in the body in one of two forms: muscle glycogen or liver glycogen. While glucose is stored as muscle glycogen, fructose is stored as liver glycogen. Fructose is not a good source of rapid glycogen restoration in muscles after exercise, but it does promote glycogen accumulation in the liver. Studies have shown that the best way to replenish glycogen stores is by consuming complex carbohydrates and glycogen. Experts recommend eating snacks with a carb-to-protein ratio of 4-to-1 to replenish energy and rebuild muscle.
| Characteristics | Values |
|---|---|
| Carbohydrates stored in the body as | Muscle glycogen or liver glycogen |
| Carbohydrates stored as muscle glycogen are derived from | Glucose or simple monosaccharides |
| Carbohydrates stored as liver glycogen are derived from | Fructose |
| Fructose | Is not a good source of rapid glycogen restoration in muscles after exercise |
| Fructose | Is a good source of energy |
| Fructose | Is not a good option when aiming to carb load |
| Fructose | Is not good for muscle glycogen replenishment before a workout |
| Fructose | Can cause stomach upset in larger dosages |
| Fructose | Does not cause the release of insulin |
| Glucose | Is a good source of glycogen restoration in muscles after exercise |
| Glucose | Is not a good source of glycogen restoration in the liver after exercise |
| Best time to eat fruit | Before a workout or first thing in the morning |
| Best time to eat starches and regular carbs | Post-workout |
| Ideal carbohydrate-to-protein ratio for post-run recovery | 4-to-1 |
| Good glycogen-replenishing fruits | Mango, watermelon, blueberries |
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What You'll Learn
Fructose is converted into liver glycogen, not muscle glycogen
Carbohydrates are an important source of energy for us. They are important for brain function and muscle function. When you consume carbohydrates, they are stored in the body in one of two forms: muscle glycogen or liver glycogen. Muscle glycogen is a stored form of carbohydrate that is shuttled into storage within the muscle. Liver glycogen is a stored form of carbohydrate that is shuttled into storage within the liver.
Fructose is a commonly ingested dietary sugar. It is primarily metabolized by the liver and increases rates of hepatic de novo lipogenesis. Fructose interacts with various transcriptional and allosteric (enzymatic) processes along the pathways of glycogen synthesis, glycolysis, and DNL within the liver. Fructose also needs to be utilized relatively quickly. Before it is converted into liver glycogen, it is flown through the bloodstream and is readily available for energy.
However, fructose can improve performance in endurance exercise. It can be consumed before a workout as it is readily available for energy. It can also be consumed first thing in the morning to replenish liver glycogen.
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Glucose is the best way to replenish muscle glycogen
Carbohydrates are an important source of energy and play a crucial role in brain and muscle function. When consumed, carbohydrates are stored in the body as glycogen in two forms: muscle glycogen and liver glycogen. Muscle glycogen is essential for intense exercise, whether aerobic or anaerobic.
Glucose is the preferred fuel source for the brain, and it is the only fuel the brain uses to produce ATP. During rest, approximately 60% of the glucose in the blood is metabolized by the brain. Therefore, maintaining normal blood glucose concentration during rest and exercise is critical.
Glucose is also the preferred fuel source for the body over blood glucose. When blood glucose is stored in the body for later use, it is called glycogen. Glycogen is stored in the muscle and liver. When glycogen stores are depleted, fatigue develops quickly.
To maximize muscle glycogen replenishment, it is recommended to consume a carbohydrate supplement as soon as possible after exercise. The supplement should be consumed frequently, such as every 30 minutes, and should provide about 1.2 to 1.5 g of carbohydrate per kg of body weight per hour. The addition of protein to the carbohydrate supplement can further enhance muscle glycogen storage and promote muscle protein accretion.
While fructose can be converted into energy and used by the body, it is not as readily stored as glycogen and primarily contributes to liver glycogen. Therefore, glucose is the best way to replenish muscle glycogen, as it is the preferred fuel source for the body and the brain and can be easily stored as glycogen in the muscle and liver.
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Consume complex carbs and glycogen to replenish glycogen stores
Consuming carbohydrates is essential for replenishing glycogen stores, as they are broken down into glucose, which is then stored as glycogen in the liver and muscles. While it is possible to replenish glycogen stores without consuming carbohydrates, through a process called gluconeogenesis, this method is less efficient and may not be as effective as direct carbohydrate intake, especially after exercise.
When it comes to replenishing glycogen stores, simple carbohydrates are often recommended due to their ability to increase insulin levels, facilitating the storage of glucose in the muscles. However, complex carbohydrates should not be overlooked. Complex carbs are generally the healthier choice as they provide the fibre our bodies need and do not cause spikes in blood sugar levels. They are particularly suitable when consumed outside of the pre- and post-workout windows.
To maximize muscle glycogen replenishment, it is recommended to consume carbohydrates as soon as possible after exercise and at frequent intervals, such as every 30 minutes. The amount of carbohydrate consumption is also crucial, with studies suggesting approximately 1.2 to 1.5 g of carbohydrate per kg of body weight per hour. Additionally, combining carbohydrates with protein can further enhance glycogen synthesis and promote muscle recovery.
Fruits contain fructose, which is metabolized by the liver and contributes to liver glycogen replenishment. Fructose is readily available for energy and is therefore recommended to be consumed before a workout. However, it is important to monitor fructose intake as it can cause stomach upset in larger doses and contribute to non-alcoholic fatty liver disease when consumed in excess. While fructose may not be the primary choice for muscle glycogen replenishment, it can still play a role in an overall nutrition plan.
In summary, to replenish glycogen stores, it is essential to consume carbohydrates, preferably simple carbohydrates around workout times and complex carbohydrates during other times. Additionally, including protein with carbohydrates can further enhance glycogen synthesis. Fruits, while not the primary source of muscle glycogen, can contribute to liver glycogen replenishment and provide energy before a workout.
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Eat fruit before a workout to replenish liver glycogen
Carbohydrates are an important source of energy for our bodies. They are important for brain function and muscle function. When you consume carbohydrates, they are stored in the body in one of two forms: muscle glycogen or liver glycogen. Muscle glycogen is derived from glucose or simple monosaccharides that come from regular starches, whereas liver glycogen is derived from fructose.
Fructose is found in fruits and is converted into liver glycogen. It is flown through the bloodstream and is readily available for energy. However, it is not stored as muscle glycogen. Therefore, it is important to eat fruit before a workout to replenish liver glycogen. The body will use the fructose first as it is readily available for energy. This will also help spare lean muscle tissue, as low levels of liver glycogen can cause the body to start breaking down muscle tissue.
It is recommended to eat fruit right before a workout or possibly a little during, but not after. After a workout, it is recommended to eat starches, regular glucose, and regular carbohydrates to replenish muscle glycogen. It is also important to replenish water and electrolytes lost through sweat.
Additionally, eating fruit first thing in the morning can also help replenish liver glycogen, as the body pulls glycogen storage from the liver during sleep.
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Dextrose is the most efficient way to replenish muscle glycogen
Carbohydrates are an important source of energy for the body. They are essential for brain function and muscle function. When you consume carbohydrates, they are stored in the body in one of two forms: as muscle glycogen or liver glycogen. Glucose is stored as muscle glycogen, and fructose is stored as liver glycogen.
Fructose is metabolized in the liver and does not affect blood glucose levels. It is turned into liver glycogen, which is used by the body for different purposes than athletic performance. Muscle glycogen, on the other hand, is critical for athletic performance and recovery.
Dextrose, also known as D-glucose, is a fast-digesting simple sugar that is chemically identical to biologically active glucose. It is quickly absorbed into the bloodstream, triggering an insulin response. This insulin spike helps to transport nutrients from the bloodstream to the muscles, improving performance and initiating the recovery and rebuilding process.
Because dextrose is a simple sugar, it is fast-digesting and ready to be absorbed. This makes it an efficient way to replenish muscle glycogen after intense training, when glycogen reserves are drained. In fact, a 2021 review in the Journal of Physiology noted that evidence supporting the normalization of muscle glycogen content with longer-term adaptation to carbohydrate restriction is weak, suggesting that dextrose can be an effective way to replenish muscle glycogen quickly.
Overall, dextrose is an efficient and inexpensive way to replenish muscle glycogen due to its chemical structure, absorption rate, and impact on insulin levels, making it a popular choice for athletes and individuals seeking improved athletic performance and recovery.
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Frequently asked questions
Fructose from fruit does not seem to replenish muscle glycogen. It is first converted into liver glycogen.
The best way to replenish muscle glycogen is by consuming complex carbs and glycogen. Dextrose is also an efficient way to replenish muscle glycogen.
Good snacks to help replenish muscle glycogen include a banana, a handful of nuts or dried fruit, low-fat yoghurt, or a sports drink.
It is best to eat fruit right before or during a workout. Fruit is not recommended post-workout.
It is best to eat a replenishing snack within 20-30 minutes of finishing your run.
