The description of the processes carried out by the organism to take advantage of stored energy is quite complex, and involves cellular respiration also known as the Krebs cycle. All the catabolic processes that will have as purpose the use of energy, whether it comes from glucose, amino acids, or fatty acids converge.
During the catabolic process it is not expected that the glucose is completely finished to start using amino acids or fats, but everything happens simultaneously, but depending on the type of molecule available, the proportions of each one will be modified.
The most important purpose of this whole description is to understand what happens to your body when you decide that stopping eating is the best way to lose weight, or commits to a hypocaloric diet, and thereby pushes your metabolism down a path extreme catabolic. It can be tempting if you only take into account that energy balance, but: How do the physiological mechanisms of your body respond to this? Is it really efficient as a strategy to lose weight?
First of all we must know that the nervous tissue, in which the brain is included, is a “sybarite” that only accepts glucose as a source of energy. When this value reaches the threshold of 75 mg / dl, the glucose savings processes begin. The first thing that happens in this case is that insulin decreases , so the glucose input to the muscle, fatty tissue and liver are reduced, leaving more availability for the brain, an organ that does not need insulin to take advantage of the glucose of the blood.
So that the organism, lacking the contribution of glucose from the diet, and with a demand for energy from the tissues (especially the brain, which does not accept another nutrient) begins to consume glycogen reserves. These reach in the best of cases for 24 hours at absolute rest, and their duration will depend on energy consumption.
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