The brain can and does burn glucose in an emergency30Day Gut Reset Reviewor when a person's diet is dominated by starch-based carbohydrates such as pasta, potatoes, bread, cereals, and legumes. However, it functions much more efficiently and effectively on the ketones found in healthy fats such as omega-3 and omega-6 fatty acids. In the absence of carbohydrates, the brain will naturally shift from glucose to fat for its primary fuel source.
Ketone usage by the brain (ketosis) is prevalent when a newborn nurses on fat-rich mother's milk. The switch to glucose dependence by the brain will not occur until carbohydrates are introduced into the child's diet. The body burns excess sugar whenever it is present mainly because it's trying to rid itself of this damaging, toxic substance. If the body requires sugar for adrenalin production — such as in the rare fight or flight response — then it can always rely on the carbohydrate stores of glycogen in the liver for this. As a result, you don't ever need to consume carbohydrates for glucose to be available to the brain or body.
Not only is glucose dependency by the brain and body unnatural, but it can also result in increasing your risks of many diseases, especially cancer. Cancer loves glucose (and other sugars) because it is anaerobic. It feeds on sugar because it is a necessary energy source for it to thrive. Glucose, fructose, and other sugars always glycate and attract free-radicals, and glycation is the primary cause of brain degeneration in aging and Alzheimer's disease. Alzheimer's is also associated with gluten sensitivity as well.