Explanations The Icelandic Food Composition Database (ISGEM) Search the ISGEM database Measurements of nutritional value Food composition tables (pdf files) Calculate nutrient content based on recipes Explanations Links to other food composition sites Explanations – ÍSGEM Below you can find various explanations in a PDF document of the information presented in the database. The explanations are only available in Icelandic. ÍSGEM explanations (PDF)