Blood sugar level In humans, glucose is the primary source of energy, and is critical for normal function, in a number of tissues, particularly the human brain which consumes approximately 60% of blood glucose in fasted, sedentary individuals. Glucose can be transported from the intestines or liver to other tissues in the body via the bloodstream. Cellular glucose uptake is primarily regulated by insulin, a hormone produced in the pancreas. Glucose levels are usually lowest in the morning, before the first meal of the day, and rise after meals for an hour or two by a few millimoles. Blood sugar levels outside the
Achim Peters at an appropriate level. This goal is achieved in healthy individuals by allocating (diverting) energy from the body. The "Selfish Brain" theory represents a further development of already existing theories on the organization of the energy supply within the human organism. Blood sugar and fat deposition feedback systems constitute a complex system for regulating the intake of nutrients which is controlled by a hypothalamic center. The "Energy on demand” system for energy supply to the brain is seen as a supraordinate instance of this setup, which exerts control over the organs that regulate the blood sugar and fat feedback loops.