Causes. Besides the situations described above, a person with diabetes can experience hypoglycemia when they do not eat meals at regular hours or only eat part of their meals. Hypoglycemia can also be brought on when the person exercises more strenuously than they’re used to or drinks too much alcohol.
In reactive hypoglycemia, a meal causes the person’s blood sugar to spike, especially if it is made mostly of refined carbohydrates and sugars. This stimulates the pancreas into releasing too much hormone in response. The blood sugar drops but then gradually rises to normal levels. People with reactive hypoglycemia are more at risk for it if they are obese, smoke, drink heavily or are under stress. Some doctors believe that reactive hypoglycemia is a sign that the person is pre-diabetic.