There may exist such a pathway, but we need to check its capacity, efficiency and by-product production. Maybe it is a pathway for critical situations only and we should not relay on it for prolonged periods of time.
Maybe the carbohydrate to glucose pathway is for critical situations only and we should not relay on it for prolonged periods of time.
These are evolutionary adaptions that let us extract energy efficiently from our environment, maybe yesterday's sensationalist news about our alcohol dehydrogenase efficiency is proof that we should use alcohol for all energy needs.