How Does Flax Seed And Coconut Oil Help To Treat Dementia?

My mother has mild dementia - vascular & alziemhers. A nutritionist has advised me that taking coconut oil & flax seed oil on a daily basis can improve her mental state and reduce the onset of the dementia. Please can you tell me how the use of flaxseed and coconut oil can physiologically assist her? How do these oils reach the brain. I know that many studies have been done to back up the benefits of both these oils; including taking someone with severe demetia to mild dementia within 2 weeks with 2 tablespoons three times a day. I would GREATLY appreciate any help on this matter as I want to do whatever is possible for my mother. best wishes and thank you Lizzi