What causes ?hypoglycemia?

Many causes: Most web sites will list the many many causes of hypoglycemia that can occur when you fast and after eating. If you suspect you have "hypoglycemia" see your doctor.

Usually sugar intake: Eat only meat or fish or cheese or eggs or poultry and low starch veggies, drink only water. In other words avoid all carbs, carbs will only briefly raise your sugar levels and then your Insulin levels. The fats in the meat or fish or cheese or eggs or poultry will act like a "log on your metabolic fire" to keep your blood sugar stable for hours without raising insulin.