On a theoretic level, moderate consumption of coconut oil on a daily basis may help against Alzheimer’s. However, research is still ongoing, so there’s still no scientific evidence that confirms theory. If your dad finds it delicious, then I think it’s great to just proceed, as daily moderate consumption will generally not have any negative side effects.

Adding coconut oil to black and green tea is no problem at all. The most important thing is, like with many foods, is to consume in moderation. So if u consume a cup of two per day, and add a spoon of coconut oil, I definitely do not classify that as overconsumption.