I don't think that you can really make any determination of the presence of an insulinoma based on a response to orally administered sugary compounds. Some animals snap out, some don't - a blood test is always the best way to tell - properly done, it takes all of the guesswork out of interpreting clinical signs or response to dietary manipulation. With kindest regards, Bruce H. Williams, DVM, DACVP Join the Ferret Health List at http://groups.yahoo.com/group/Ferret-Health-list [Posted in FML issue 3408]