Short-term decreases in performance

As was already said, cutting off carbs might first make you feel fatigued. This involves a temporary decrease in exercise performance. Decreased muscle glycogen levels, the main and most effective fuel source for all types of high-intensity exercise, are the main contributor to it.

Many people on ketogenic diets say that their performance returns to normal after a few weeks. A ketogenic diet may even be beneficial in some ultra-endurance events and sports. Additionally, there are other benefits, primary among them an improved ability to burn more fat when exercising. According to one well-known research, athletes who switched to a ketogenic diet burnt up to 230% more fat during exercise than athletes who weren't on this diet.