Relative hypoglycemia is a clinical syndrome in which patients develop symptoms referable to any system of the body as the result of a relative drop in blood sugar level in response to a high carbohydrate food intake and drinks containing caffeine. In the past the syndrome has been called functional hyperinsulinism, essential hypoglycemia, functional hypoglycemia, dysinsulinism, hypoglycemic fatigue, and neurogenic hypoglycemia. These older terms according to Buehler’ are all inaccurate inasmuch as a patient may present this syndrome when there is only a relative drop in blood sugar levels without an absolute drop into low blood sugar or hypoglycemic levels. Also studies have never showed an excessive amount of insulin circulating in the blood. -Henry M. Salzer, MD