Here are two aspects that jump out to me:
– “Years” is the third most common word used. That makes sense for two reasons: a) according to a Mayo clinic summary, the life expectancy of a patient diagnosed with Alzheimers is 8-10 years, so people often live with the disorder for many years, and b) many of the users were likely discussing age at diagnosis, since Alzheimers is associated with aging.
– The word “oil” likely refers to coconut oil, which is often discussed as a treatment for Alzheimers. This is the only specific treatment mentioned in the top 30 words. According to alz.org, coconut oil has never been tested in clinical trials.