You need to get your body metabolically flexible and accustomed to getting energy from both carbohydrates and fat stores.
If you don't eat carbohydrates, your body produces glucose in the liver without any problems if you are a healthy person. Please note that we are not saying that carbohydrates are bad or that you should stop consuming them, we are just clarifying that your body is capable of maintaining the level of glucose you need in your blood, even if you don't consume carbohydrates.
For years we have been sold a nutritional pyramid in which the BSA is full of carbohydrates, indicating that they should be our main source of food.
And that's not true. If you're a person who doesn't exercise and doesn't move around much, you'll probably do much better with very few carbs.
When we eat, the liver stores glucose in the form of glycogen for when we need it.
The liver can convert glycogen into glucose through a process called glycogenolysis. It can also make glucose if we haven't eaten carbohydrates by harvesting amino acids through a process called gluconeogenesis.
The liver can also make ketones , another fuel for the body, when we are low on glucose. Our body is responsible for storing the sugar it has for those organs that need it and the liver makes ketones to supplement limited sugar reserves.
Ketones are used as energy by muscles and other body organs.
The liver is responsible for producing this alternative fuel from fats through a process called ketogenesis. This process begins when hormones indicate that there is a low level of insulin in the body and is essential for maintaining minimum glucose levels during periods of fasting.