You have about 160,000 Kcals of fat available to burn – producing your own glucose in the process when needed (for anaerobic bursts). In contrast you only store around 400 to 500 Kcals of glucose/glycogen ready for use so if you are not adapted to burning fat then you are physically dependent and addicted to eating carbs. When you hear of a runner “hitting the wall” it’s only because of their unnatural carb addiction – an efficient fat burning athlete can run all day and will never have this problem. The human body is specifically designed to run long distance and can outrun almost every other animal on this planet – we can even run though intense heat because we sweat.
A ketogenic diet helps control blood sugar levels. It is excellent for managing type 2 diabetes, sometimes even leading to complete reversal of the disease. This has been proven in studies. It makes perfect sense since keto lowers blood-sugar levels, reduces the need of medications and reduces the potentially negative impact of high insulin levels.