Is the diet suitable for children with GLUT1? If your child has been diagnosed with GLUT1 deficiency syndrome* the ketogenic diet may be a life-time treatment. * A rare genetic disorder that impairs brain metabolism. GLUT1 (a protein) is responsible for the transport of glucose (a sugar) from the blood into the brain. Glucose is the main source of fuel for the brain; a shortage of glucose leads to impairment of brain function and growth.