Hello everyone! I'm the owner of Fusubon.
This time I would like to write about blood glucose levels, gluconeogenesis, and fat utilization! As you learn more about carbohydrate restriction, you may wonder when the energy source is switched between glucose (sugar) and fat, or what percentage is used.
What is hunger, which causes gluconeogenesis and the production of ketone bodies?
I will answer that question today. Before I begin, let me first define the word hunger. Hunger refers to a state in which you are not taking in energy from the intestines, i.e. your intestines are empty.
Specifically, this refers to three hours or more after a meal. When you are fasting, the blood sugar level in your blood is basically constant. But your body still needs energy. So, first, the glycogen stored in your muscles and liver is converted into glucose and used as energy for a few hours.
What is gluconeogenesis?
After that, a process called gluconeogenesis occurs, in which glucose is produced from amino acids derived from muscle and glycerol broken down from fat. If the human body could only use glucose-derived energy, gluconeogenesis would continue to occur and muscle mass would continue to decrease, or blood sugar levels would continue to fall, but when you are hungry, the human body changes its metabolic functions.
Specifically , when you are hungry, glucose is used only by the central nervous system (brain and spinal cord), and energy for other activities is provided by the energy produced by burning fat. In other words, glucose produced by gluconeogenesis is used only by the central nervous system (brain and spinal cord).
Some people may be concerned that if they restrict carbohydrates, they will continue to lose muscle mass when they are hungry, but when you are hungry, glucose is only used by the central nervous system (brain and spinal cord), and the energy needed for other life activities is derived from fat .
So don't worry, if you take in enough protein and do a little strength training you will be able to maintain and build muscle!
That's all about the boundary between gluconeogenesis and fat burning! See you next time!
