What to do to not get hypoglycemia?

My father was diagnosed with type 2 diabetes mellitus, atherosclerosis, due to fatty condition so my father was very active every day. But I hear people with diabetes are at risk of hypoglycemia due to over-activity. Please ask if my dad's exercise has any effect?

Exercise is an important requirement for diabetes, maintaining regular exercise will significantly improve the condition of hyperglycemia, atherosclerosis, stabilize blood pressure. However, excessive exercise and non-compliance with a physician's prescription may lead to hypoglycaemia in patients on insulin treatment or on hypoglycemic medications. Hypoglycemia can occur either during or after the end of the exercise. Even in some patients with type 1 diabetes, this risk can be delayed, after 6 to 14 hours, even 24 hours if the intensity is severe and long.

In addition, diabetic patients with excessive exercise may have hyperglycemia, chest pain, arrhythmia, hemorrhage or retinal detachment in people with polyps at the bottom stage 3, exacerbating renal disease caused by diabetes ...

To avoid the risk, your father should practice with reasonable intensity, it is best to walk every day. Besides, there should be a reasonable diet as prescribed by the doctor.