The ketogenic diet is a very low-carb, high-fat, and moderate-protein diet that has been linked to a long list of potential health benefits, ranging from improved blood sugar control to decreased hunger levels. However, its effect on athletic performance remains controversial. While some claim that keto can boost fat burning and enhance endurance, others note that it could drain energy levels and make muscle growth more challenging.
The diet's impact on exercise performance depends on the type of activity. Low-intensity, steady-state workouts, like jogging or cycling, tend to be the least affected by the diet. On the other hand, high-intensity exercises, like sprinting or jumping rope, may be more challenging on a keto diet as they are usually powered by carbohydrates.
Additionally, the timing of nutrition is crucial for workouts. While some prefer to work out in a fasted state, others opt to eat before exercising. Pre-workout meals or high-fat drinks can provide energy for athletic performance, and it's essential to stay hydrated and maintain adequate electrolyte levels.
In conclusion, the keto diet may have benefits for certain types of exercise, but more research is needed to fully understand its impact on athletic performance and potential drawbacks.
What You'll Learn
Eating protein is crucial for exercise
Protein is an essential macronutrient to consume after a workout. During exercise, tiny fibres in your muscles break apart, and protein is required to repair and rebuild these muscles. This process is called myofibrillar hypertrophy, and it allows your muscles to strengthen and repair themselves.
The amount of protein you need depends on the intensity and duration of your workout. For example, if you engage in heavy exercise, you should aim for 1.6 g of protein per kg of body weight. On the other hand, moderate exercise requires 1.3 g of protein per kg of body weight, and lighter exercise requires 1 g of protein per kg of body weight.
It is also important to consume protein within a specific time frame after your workout. This is known as the anabolic window, and it lasts for up to 48 hours after resistance exercise. However, you don't need to worry too much about the timing of your protein intake, as long as you are consuming adequate amounts of protein throughout the day.
When it comes to choosing a protein source, whey protein is an excellent option. It is a complete protein, containing all the essential amino acids, including branched-chain amino acids (BCAAs) such as leucine, which is crucial for muscle growth. Other complete protein sources include meat, fish, and eggs.
In addition to protein, it is also important to consume healthy fats and carbohydrates after your workout. Avocados, nuts and nut butter, and smoothies with coconut cream are good sources of healthy fats. Carbohydrate requirements depend on your activity level, with higher-intensity exercises requiring more carbs.
By consuming a balanced combination of protein, healthy fats, and carbohydrates after your workout, you will optimise your exercise routine and support your body's recovery process.
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High-intensity exercises may be more challenging
High-intensity exercises such as sprinting, CrossFit, and other anaerobic activities can be more challenging on a keto diet. This is because high-intensity exercises rely on readily available sources of energy, typically derived from carbohydrates. When the body is in a state of ketosis, it prioritises burning fat for fuel instead of glucose, which is derived from carbohydrates. As a result, the body may struggle to produce enough energy to sustain high-intensity exercises.
However, this doesn't mean that high-intensity exercises are impossible on a keto diet. With some adjustments, individuals can still engage in these types of exercises while reaping the benefits of ketosis. Here are some tips to help optimise high-intensity workouts while following a keto diet:
- Reach a fat-adapted state: The key to performing high-intensity exercises on a keto diet is to ensure your body has adapted to burning fat as its primary fuel source. This means consistently keeping your carb intake to a minimum, typically below 50 grams per day, for several weeks. This will help your body become more efficient at utilising fat for energy during intense workouts.
- Consider modifying your keto diet: If you're engaging in rigorous workouts, you may need to modify your keto diet slightly. This doesn't mean abandoning the keto principles, but rather making small adjustments to ensure you have enough fuel for your workouts. You can add a small amount of extra carbohydrates to your diet, ideally around your workout sessions. For example, you could consume 25 grams of carbohydrates 30-60 minutes before your workout and another 25 grams as part of your post-workout recovery. This could include a couple of slices of bread or a cup of walnuts and hazelnuts with some berries.
- Allow for an adjustment period: When you first start the keto diet, it's normal for your body to go through an adjustment period as it transitions from relying on glucose to burning fat. During this time, your performance may suffer slightly, but it will improve once your body adapts to the new fuel source.
- Focus on adequate protein intake: Protein is crucial for muscle repair and growth, especially when engaging in high-intensity exercises. Ensure you're consuming enough high-quality protein sources such as meat, fish, eggs, and whey protein. This will help support muscle recovery and improve your overall performance.
- Optimise your micronutrient intake: In addition to protein, pay attention to your micronutrient intake. Include micronutrient-rich foods such as leafy greens, avocados, nuts, and seeds in your diet. These provide essential vitamins and minerals that support overall health and exercise performance.
- Consider exogenous ketones: Exogenous ketones, such as ketone salts and ketone esters, can be consumed directly to boost ketone levels in the body. Research has shown that exogenous ketones can enhance exercise performance, increase fat burning, and improve glycogen conservation.
- Try MCT oil: Medium-chain triglyceride (MCT) oil is another useful supplement for keto dieters. MCT oil is quickly converted into ketones by the liver, providing a quick source of energy for high-intensity workouts. Adding MCT oil to your post-workout protein shake is a great way to boost your ketone levels.
- Prioritise recovery: High-intensity exercises can be taxing on the body, so it's important to allow for adequate recovery. Ensure you're getting enough sleep, staying hydrated, and incorporating rest days into your workout routine. This will help your body repair and rejuvenate between intense training sessions.
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Keto may boost fat burn
The ketogenic diet is a high-fat, moderate-protein, and low-carb diet. It works by lowering insulin levels, producing ketones, and increasing fat burning. Here's how:
Higher Protein Intake
Ketogenic diets often lead to an increase in protein intake, which has many weight loss benefits. Protein reduces levels of the hunger hormone ghrelin while boosting appetite-reducing hormones. This leads to a spontaneous reduction in calorie intake.
Gluconeogenesis
On a keto diet, your body converts fat and protein into carbs for fuel. This process may burn many additional calories each day.
Appetite Suppressant
Ketogenic diets help you feel full. This is supported by positive changes in hunger hormones, including leptin and ghrelin.
Improved Insulin Sensitivity
Ketogenic diets can drastically improve insulin sensitivity, which can help improve fuel utilization and metabolism.
Decreased Fat Storage
Ketogenic diets may reduce lipogenesis, the process of converting sugar into fat. When there's minimal intake of carbs, fat is used for energy.
Increased Fat Burning
Several studies have found that ketogenic diets may slightly increase the amount of fat you burn during rest, daily activity, and exercise.
Other Benefits
The ketogenic diet is an effective weight loss diet that's well-supported by evidence. It is very filling and usually does not require calorie counting. It may also help manage metabolic diseases by improving insulin function, lowering inflammation, and promoting fat loss.
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You may feel less energised initially
When starting a keto diet, you may experience a decrease in energy levels. This is because the keto diet involves a severe restriction of carbohydrates, which are the body's main source of energy. As your body adapts to using fat for fuel instead of carbs, you may feel less energised, especially during high-intensity exercises. This reduction in energy may make it challenging to perform high-intensity workouts and could last for several weeks. However, it is important to note that energy levels tend to gradually increase back to normal over time.
Additionally, the keto diet may also affect your desire to exercise. Research suggests that increased levels of ketones in the blood can lead to increased feelings of fatigue and a decreased desire to engage in physical activity. This can further impact your energy levels and exercise performance during the initial stages of the keto diet.
To mitigate these effects, it is recommended to take it easy in the gym during the first few weeks of the keto diet. Listen to your body and give yourself time to adjust to the new energy source. You may also want to consider timing your nutrition right for your workouts. Experiment with eating before or after exercise to see what works best for you.
Furthermore, ensuring adequate hydration and electrolyte intake can also help. Consume foods high in magnesium, potassium, and sodium, such as pumpkin seeds, avocados, and leafy greens, or consider using electrolyte powders.
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Your body may burn calories quicker
Exercising is one of the best ways to enhance a keto lifestyle and improve overall health and wellness. However, it was long believed that carbohydrates were critical for workout energy. This led to the common practice of "carb loading" before and after exercise.
Recent research has shown that this is not the case and that a keto diet can actually help your body burn calories quicker. Carbohydrates are not the only fuel source the body can use during and after exercise. In fact, studies suggest carbs are perhaps not even the optimal source, and that a higher fat, low-carb diet has more promising results for pre- and post-workout meals.
When your body is in ketosis, it is in prime fat-burning mode. This means that during exercise, your body can tap into stored body fat for fuel. In fact, studies have shown that ketogenic dieters burn over twice as much fat during exercise compared to those fuelling themselves with carbs.
A keto diet typically calls for up to 90% of your daily calories to come from fat. This is often hard for people to maintain, but research has shown that people can achieve faster weight loss with a keto diet compared to a calorie-reduction diet.
However, it is important to note that in the long term, it can be tough to keep the weight off this way. Therefore, it is recommended that after a few weeks of keto, you switch to a reduced-calorie Mediterranean-style diet and increase your physical activity to manage your weight loss for the long term.
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