When a person is fasting, their body is not receiving any food to convert into energy. In response, the body begins to break down stored energy sources, such as glycogen and fat, to provide the energy it needs to function.
One of the primary ways the body maintains blood glucose levels is through the release of stored glucose from the liver. When a person is fasting, their liver releases glucose into the bloodstream to help maintain blood glucose levels.
Additionally, the body can also produce glucose through a process called gluconeogenesis. This process involves the liver and kidneys converting non-carbohydrate sources, such as amino acids and fatty acids, into glucose.
As a result, even when a person is fasting, their body is still able to maintain relatively stable blood glucose levels. While blood glucose levels may decrease slightly during fasting, they do not typically show a significant decrease due to the body's ability to produce and release glucose from stored sources.