So what actually causes you to bonk? Bonking can occur when your body runs out of glucose to burn, and your muscles and liver are depleted of glycogen. Because glucose is the primary fuel source for the brain, you may also experience central nervous system fatigue.

How do you stop bonk?

To avoid bonking, pace yourself by riding at a low intensity during efforts lasting longer than two hours. If you're going to ride at a high intensity, keep the effort to two hours or less. Your body can process 60 grams of carbohydrates per hour.

What are the symptoms of bonking?

What does a bonk feel like? The symptoms of a bonk can vary, but on a physical side you will generally feel extremely weak and tired and you may shake, sweat a lot and feel dizzy or light-headed. You may also have heart palpitations and will probably be very hungry.