Dementia in Swedish Twins: Predicting Incident Cases

Which twin would develop dementia was predicted by less favorable lipid values (higher apoB, ratio of apoB to apoA1, and total cholesterol

This genetics paper is also very relevant A cluster of cholesterol-related genes confers susceptibility for Alzheimer's disease

 as is this paper Convergence of genes implicated in Alzheimer's disease on the cerebral cholesterol shuttle: APP, cholesterol, lipoproteins, and atherosclerosis.

Cholesterol and lipoprotein related genes are listed here