In the 1980s I was teaching an evening math class in a summer session at a community college. I had a student who told me she had hypoglycemic episodes, but she did not have diabetes. I gave a math test one evening, and she had low blood sugar. I agreed to give her a make-up test at a later date. She wanted to take the test on a weekend, and I found that she did not live very far from my house. I scheduled the test at my house on a Sunday afternoon. She knocked on our door, and she was sweating. It was a very hot summer day. I did not realize that she did not have transportation, and she had walked about two miles from her home. She took the test, but she had low blood sugar. I don’t think she would have been able to walk home, so I drove her to her house. We compared our conditions. Her pancreas was overactive, and it produced too much insulin to compensate for anything that she ate that contained sugar. She avoided food with sugar. She could not use sugar when she had a hypo since that would cause her pancreas to produce too much insulin, and her blood sugar would drop even lower. Her diet consisted of a lot of protein, and food that had slower acting carbs. I was very sorry for her, and I did everything I could to help her through the summer session.
The link below gives more information about hypoglycemia, without diabetes.
“Hypoglycemia is a condition that occurs when the sugar levels in your blood are too low. Many people think of hypoglycemia as something that only occurs in people with diabetes. However, it can also occur in people who don’t have diabetes.
If you don’t have diabetes, hypoglycemia can happen if your body can’t stabilize your blood sugar levels. It can also happen after meals if your body produces too much insulin. Hypoglycemia in people who don’t have diabetes is less common than hypoglycemia that occurs in people who have diabetes or related conditions.”