Hyperglycemia More Condition_symptoms Why Does Hyperglycemia Make One Feel Hungry?

Why does hyperglycemia make one feel hungry? - hyperglycemia more condition_symptoms

Hypoglycemia following insulin deficiency and resistance is, but both conditions are far apart in terms of blood sugar levels. How can both cause hunger?

If hyperglycemia is not sufficient to provide energy for the cells of the body? I understand that the cell is surrounded by glucose, why not give it? Which mechanism is activated (as I believe, insulin, glucagon-) axis?

Furthermore, why hyperglycemia cause mental fatigue? If the fuel supply of glucose in the brain?