Exogenous ketones can be a utilized fuel source, as evidenced by a Parkinson's patient experiencing cessation of tremor and regaining a sense of smell after administering ketones and following a ketogenic diet.

“we had an individual with Parkinson's come in and we literally gave him a dose of Examiners ketones within 30 minutes you can see his cognitive like we do a whole bunch of cognitive tasks but like literally his tremor stopped like physically his tremor stopped because there was an inefficiency of fuel inside of his brain and the minute you provide that now we took him and put him on 8 to 12 weeks of a well-formulated ketogenic diet and like he's regaining a sense of smell like no he's a lawyer like no longer has tremor what he's in the courtroom like it's a fuel like it's a fuel that he's now able to utilize it he was unable to utilize before”