GLUT1 deficiency syndrome in clinical practice.

Summary GLUT1 deficiency syndrome (GLUT1DS) is caused by impaired glucose transport into brain and is effectively treated by means of a ketogenic diet. In clinical practice the diagnosis of GLUT1DS often is challenging due to the increasing complexity of symptoms, diagnostic cut-offs for hypoglycorrhachia and genetic heterogeneity. In terms of treatment alternative ketogenic diets and their long-term side effects as well as novel compounds such as alpha-lipoic acid and triheptanoin have raised a variety of issues. The current diagnostic and therapeutic approach to GLUT1DS is discussed in this review in view of these recent developments.