This study shows why we need hdl and ldl cholesterol in our body, and how the ingestion of that both cholesterol added to exercises improve our cognitive performance.
Penelope K. Elias et al., “Serum Cholesterol and Cognitive Performance in the Framingham Heart Study”. Psychosom Med., v. 67, n. 1, jan./fev. 2005
This study shows the reducing levels of cholesterol having a negative effect in our brain, increasing our probability of having Alzheimer in more than 80%.
M. Mulder et al., “Reduced Levels of Cholesterol, Phospholipids, and Fatty Acids in Cerebrospinal Fluid of Alzheimer Disease Patients ARE Not Related to Apolipoprotein E4”. Alzheimer Disease Associated Disorders, v. 12, n. 3, set. 1998
As I said, the cholesterol isn't the villain that people said, the lack of exercise is. All the researches that shows the LDL levels being a problem doesn't has made a stratification between people who did exercises and people who doesn't. That is the evidence that I have, please, show your evidence too, and we can compare than and see what is wrong and right in both of them.
Mic the Vegan is a pretty good source. He goes into some studies in this video.
A lot of your studies are prob funded by egg people.
But my favorite Doctor is Neal Barnard.
Short version:
The USDA has come out on Neal Barnard's side stating you should eat as little cholesterol as possible.
Here's the long version: