Poor regulation of high sugar levels in the blood will leave you feeling lazy and tired. Your muscles are deprived of energy and you may feel too weak or extremely fatigued to carry out regular everyday activities.
The reason behind this: Glucose is unable to enter into the body cells secondary to high insulin resistance due to which your muscles literally have less energy to function actively. Your body is additionally breaking down muscle protein to use it as an alternate source of energy. Coupled with poor sleep, both these factors are responsible for easy fatigability.