To make a long story short, Dr. Newport started giving a daily dose of coconut oil to her husband, Steve. Just 60 days after he started taking it, Dr. Newport recalls that Steve was alert and happy, talkative and making jokes, and the tremor he’d developed was less noticeable. He was able to concentrate on one task instead of being easily distracted. Steve receives about 2 tablespoons of coconut oil twice a day, to make sure that there are no periods where ketone bodies aren’t circulating.
Sounds like its working for him. Personally, I take a small spoonful of coconut oil several times per week. I don't think it is about belief. There are scientific studies to support coconut oil benefits, as well other substances. I should probably post some here, but don't have the time to find at the moment. Experience counts as well; try it for yourself and see if you see any benefit (or harm).
This is the idea behind bulletproof coffee too. The coconut oil and grass fed butter give your brain everything it needs, plus you get your regular dose of caffeine. It allows you to skip lots of morning carbs and still get moving. It takes some getting used to, but seems to work better than oil capsules and gives you lots more energy.
https://www.bulletproofexec.com/how-to-make-your-coffee-bulletproof-and-your-morning-too/