November 2005 UTC Fat is never converted to Glc not at least in humans according to the textbooks Let me add few things First Glc enters leaves the cell through a proces called facilitated diffusion Which means that as soon as the Glc concentration inside the cell is somehow increased Glc will start leaving the cell which by the way happens in hepatocytes during glycogenolysis Second even if there was a way to keep Glc inside the cell say through active transport Glc poses a danger to the cell integrity as Glc is a highly osmotically active compound The cell solves these two issues with a single solution by synthesizing glycogen from Glc the enormous glycogen molecules can t leave the cell and by having osmotically inert glycogen instead of Glc the cell avoids the osmotic shock 13 55 30