Explain why people with poorly controlled diabetes are at risk for amputation.

Poorly controlled diabetes inevitably leads to damage to the body's organs, nerves, and blood vessels. Diabetics with nerve ending damage to their extremities can't feel when they have an injury or if there's an infection. So when the infection has had time to spread or set in the infection has already become severe that the tissue affected has become "dead" and the only option left is for doctors to amputate whatever is infected.