"The group found that protein feeding of rats markedly increased the activity of genes involved in glucose production in the animals' small intestine. Those activities led to glucose synthesis and release into the portal vein--the vessel that conducts blood from digestive and other organs to the liver--a phenomenon lasting after the assimilation of glucose from the diet." Please note this last statement - "a phenomenon lasting after the assimilation of glucose from the diet.":

http://www.sciencedaily.com/releases...1109181818.htm