I propose that blood glucose is like the voltage in electrical systems. More it differs and fluctuates from a certain constant, the greater the system’s malfunction is. For example, if the voltage for lights is 220 V, but it jumps to 400 V, then bulbs will shine much brighter for a short time and than would burn out.
Optimal voltage for energy in the body might be set as the blood sugar level of 4.4 ± 0.5 mmol/L (79 ± 9 mg/dL).
The relationship between the voltage (V), resistance (R), and current (I) is V=IR; this is known as Ohm’s law.
In the case of blood sugar:
V – blood glucose level, I – glucose current in the blood, R – resistance of cells.