When your diet is depleted of carbs, your glycogen levels drop and you enter ketosis—a process in which your brain burns ketone bodies to avoid draining the protein stored in your muscles and instead uses energy from your fat stores.
Ketosis- stroke Detailed Description: A ketogenic diet can induce ketosis after a period of 2-3 days and offer the brain an alternative energy substrate to glucose in the form of ketone bodies. Feeding the brain ketone bodies can potentially benefit a stroke patient’s brain in several ways: Stroke is characterized by impaired blood and oxygen supply to brain cells. This can cause glucose to convert to lactate which is toxic for the brain. Decreasing glucose availability to brain cells may thus potentially decrease the area of damage in the ischemic penumbra (perifephery of the stroke). Compared with sugar, burning ketone bodies requires less oxygen to produce the same amount of energy, suggesting that brain cells could have a potential greater chance of surviving during circumstances of reduced oxygen supply. By decreasing mitochondrial activity, ROS synthesis is also decreased, which can help decrease the necrotic area around the ischemic penumbra. Furthermore, the ketogenic diet does not induce an increase in blood sugar which could be an advantage since many stroke patients are admitted with hyperglycemia associated with a worse outcome.