Brain Energy and Cognition

Published work is described as associating ketogenic diet and a dose of exogenous ketones with improved brain network stability in aging adults. Ketones are distinguished from stimulants because they provide substrate without directly stimulating the brain. Claims about flow, focus, and nootropic-like effects are presented as less rigorously established than brain energy and network stability claims. Ketones can cross the blood-brain barrier and provide an alternative energy substrate to the brain when glucose is limited.