Yeah this guy is the business. His Alzheimer's experiment was two groups 12 weeks on dietician designed low fat for one group and 12 weeks on keto for the other group
Then both groups go on normal diet for 12 weeks to clear any effects from the previous part
Then they swap. The first group does keto for 12 weeks and the second follows the dietician's low fat diet
So each person had both treatments
Note that there is no current treatment so you couldn't really compare to the current standard of care