From this NYT article VITAL SIGNS RISKS; Midlife Cholesterol Tied to Alzheimer's:
While earlier studies had shown a link between high cholesterol in midlife and an elevated risk of Alzheimer's disease, ''we were surprised to see the association with borderline levels.''
A different study discussed in this blog post, Dementia link to 'mid-life ills', substantiates this claim and states, “High mid-life cholesterol increased the risk of Alzheimer's disease regardless of diabetes, high blood pressure, obesity, smoking and late-life stroke."
Perhaps a change in diet and some exercise would be something you might want to consider. High intensity Interval training (HIIT) has been shown to lower blood pressure and lower LDL (Bad) Cholesterol. HIIT is the type of training we do at both of our facilities: Austin Personal Trainers or New Orleans Personal Trainers.