Science Behind Keto Diet and Athletic Performance

The ketogenic diet, sometimes known as “keto,” is a low-carb, high-fat diet that has become more well-known in recent years due to its possible health advantages, such as weight loss, better blood sugar regulation, and increased energy. But does keto help with strength and endurance training specifically in athletes? The science of the Keto Diet and Athletic Performance will be discussed in this article, along with the potential advantages and disadvantages of the Keto Diet and Athletic Performance.

What is the Ketogenic Diet?

It’s critical to comprehend what the ketogenic diet comprises before delving into how it impacts sports performance. The goal of the ketogenic diet is to put the body into a state of ketosis, when it burns fat for energy instead of carbs. It consists of a high-fat, low-carb, moderate-protein diet. A ketogenic diet typically consists of 75% fat, 20% protein, and 5% carbohydrates, though this might change based on each person’s needs and objectives.

When consuming a ketogenic diet, the body produces ketones in the liver, which are used as the body’s main energy source when it is in a state of ketosis. The normal Western diet, which is abundant in carbohydrates and uses glucose as its main energy source, stands in contrast to this.

How Does Keto Affect Athletic Performance?

Endurance Training

Increased fat oxidation, or the capacity to utilise fat as a fuel source during exercise, is one of the ketogenic diet’s potential advantages for endurance athletes. The body is ready to burn fat for fuel while it is in a ketosis state, which can protect glycogen stores in the muscles and liver. Since that weariness from prolonged activity is frequently brought on by glycogen depletion, this is particularly advantageous for endurance athletes.

Although there is little research on how the ketogenic diet affects endurance performance, certain studies have produced encouraging findings. For instance, a 2016 study indicated that compared to a high-carb diet, a ketogenic diet increased endurance performance in trained cyclists. The study was published in the Journal of the International Society of Sports Nutrition. The researchers hypothesised that the enhanced performance may have been due to an increase in fat oxidation.

Strength Training

While the ketogenic diet may help endurance athletes, it’s less certain how it would affect those who lift weights. Short, powerful bursts of energy, mostly from the body’s glycogen reserves, are needed for strength training. As a result, a ketogenic diet may not be the best for performance during strength training.

Yet, some studies have indicated that a ketogenic diet may be advantageous for weight loss and body composition, which indirectly enhances strength training performance. In contrast to a conventional Western diet, a ketogenic diet paired with resistance training significantly reduced body fat percentage and increased lean body mass, according to a 2018 study published in the Journal of Strength and Conditioning Research.

Boost your endurance and strength with the Keto Diet

Science Behind Keto Diet and Athletic Performance

Exercise intensity, duration, and personal metabolic characteristics all play a role in the complex interplay between glucose and fat consumption during exercise. The body predominantly uses fat as a fuel source when engaging in low-intensity activity. The body starts to rely more on carbs to provide energy as exercise intensity increases. This is due to the fact that carbs can be converted into energy more quickly than lipids.

The goal of the ketogenic diet is to change the body’s metabolism such that fat is used as its main fuel source. It is a high-fat, low-carbohydrate diet. The body enters a state of ketosis when on a ketogenic diet, producing and using ketones as fuel instead of glucose. When carbohydrate intake is reduced, the liver makes ketones from body fat that has been stored.

According to research, eating a ketogenic diet can drastically change how much fuel is used when exercising. According to studies, athletes who follow a ketogenic diet burn fat more quickly during exercise than those who follow a high-carbohydrate diet. Because of this, their bodies are better equipped to use fat as fuel, preserving glycogen stores and delaying the onset of exhaustion during intense exercise.

Yet, using fat as your primary fuel source during exercise has several potential downsides. Because the body can digest fats more quickly than carbs, athletes who follow a ketogenic diet may perform less well during high-intensity activity. Athletes that engage in high-intensity, high-volume training may also find it unsuitable because the ketogenic diet restricts carbohydrate consumption because these activities use a lot of glycogen stores.

Mixed results have been found in studies on how the ketogenic diet affects athletic performance. While other studies revealed no appreciable improvements in performance when compared to athletes on a high-carb diet, some have discovered that athletes following a ketogenic diet have greater endurance. To completely comprehend the impact of the Keto Diet and Athletic Performance and how it might be optimised for various types of athletes and sports, more research is required.

Potential Benefits of the Ketogenic Diet for Athletic Performance

  • Improved Fat Oxidation: Increased fat oxidation is one of the ketogenic diet’s possible advantages for improving athletic performance, as was already highlighted. Athletes may be able to save glycogen levels and postpone tiredness during prolonged activity by using fat as their main fuel source.
  • Reduced Inflammation: Exercise-induced inflammation has a beneficial effect on muscle growth and repair. Chronic inflammation, however, may be harmful to both sports performance and general health. The ketogenic diet may have anti-inflammatory benefits, which may be advantageous for athletes, according to some research.
  • Weight Loss and Body Composition: It’s crucial Keto Diet and Athletic Performance to maintain a healthy body weight and body composition, especially in sports that call on power or quickness.

Potential Drawbacks of the Keto Diet and Athletic Performance

  • Decreased Glycogen Stores: The depletion of glycogen stores is one of the ketogenic diet’s main limitations for athletic performance. A low-carbohydrate diet can deplete the body’s glycogen stores, which can result in lower performance in activities that call for brief bursts of intense energy. Glycogen is the body’s major fuel source for high-intensity exercise.
  • Adaptation Period: It might be difficult to switch to a ketogenic diet because the body takes some time to adjust to the new fuel source. Athletes may experience decreased energy levels and performance during this transition phase, which can be harmful to training and competition.
  • Nutrient Deficiencies: A ketogenic diet can result in nutritional deficits, particularly in vital vitamins and minerals including calcium, magnesium, and vitamin D. This can be an issue for sportsmen because these nutrients are necessary for healthy bones and functioning muscles.


The ketogenic diet has grown in popularity in recent years because to its promise for promoting weight loss, better blood sugar regulation, and an increase in energy. The ketogenic diet may aid endurance athletes by improving fat oxidation, according to some studies, despite the paucity of evidence on its effects on the Keto Diet and Athletic Performance.

The ketogenic diet can cause glycogen depletion and impaired performance, therefore it may not be the best choice for athletes who need quick bursts of powerful energy. Athletes who decide to adopt a ketogenic diet should also be aware of possible dietary shortages and the possible need for an adaptation phase.

Rev up your athletic performance with the power of Keto!


  • Can a ketogenic diet help with weight loss?

Absolutely, studies have proven that the ketogenic diet helps people lose weight and lower their body fat percentage.

  • Can a ketogenic diet benefit endurance athletes?

According to some research, the ketogenic diet may help endurance athletes by boosting fat oxidation while conserving glycogen stores.

  • Can a ketogenic diet benefit strength training?

Although the effects of the ketogenic diet on strength training are less obvious, by altering body composition and lowering body fat percentage, it may indirectly enhance strength training performance.

  • Is it safe to follow a ketogenic diet as an athlete?

A ketogenic diet can be healthy for athletes to follow, but it’s crucial to be aware of any possible dietary deficits and the possible adjustment phase.

  • Should athletes follow a ketogenic diet?

Athletes’ goals, sport, and personal preferences should all be taken into consideration when deciding whether to adopt a ketogenic diet. A licenced dietitian should work closely with athletes who are thinking about a ketogenic diet to make sure they are getting the right nutrients and fuel for their sport.

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