 In March 2009 , <unk> was approved as a medical food by the US Food and Drug Administration for the " dietary management of the metabolic processes and nutritional requirements associated with mild to moderate Alzheimer 's disease " . Glucose metabolism by the brain is impaired in Alzheimer 's disease , and it is proposed that ketone bodies may provide an alternative energy source . <unk> is a powdered form of a medium @-@ chain triglyceride , specifically <unk> triglyceride . 
