[1] http://newsroom.ucla.edu/releases/memory-loss-associated-wit...
> Six of the patients had had to discontinue working or were struggling with their jobs at the time of presentation, and all were able to return to work or continue working with improved performance
Is this usual or unusual? When you et a new illness or symptom you may not be able to work, but after a time you get some coping strategies and adapt to your new capabilities and can return (partially?) to work. Perhaps they got an usual counseling to help them, and all the effect is due to the counselling and not to the diet. Perhaps they get weekly/monthly interview that were unintended counseling. Perhaps ...
Without a control group, it's difficult to guess how many of them would have got a similar result.