Coconut oil is another one.
http://www.alzheimers.net/2013-05-29/coconut-oil-for-alzheimers/
Type 3 diabetes?
http://opinionator.blogs.nytimes.com/2012/09/25/bittman-is-alzheimers-type-3-diabetes/?_r=0
Besides butter, coconut oil is the only other fat I use.
Coconut oil is even good as a moisturizer.