Typically, the spike of insulin does its job too well and has clears the
glucose too quickly. For many, this results
in a deficit of sugar. We experience the hypoglycemic'crash' of feeling foggy headed as our brain needs more glucose. We get cravings for sugar. As soon as we eat something sweet, we calm down. However, within an hour, we are back to craving sweets again.
Insulin is known as the 'hunger hormone'. When you are on a diet, the blood glucose is low.