Genetics?

I wonder if it is all the supplements, steroids, and other PED’s that maybe messed up the chemistry of this foreign born A list actor’s brain, rather than just genetics.

Chris Hemsworth

Chris Hemsworth learns he’s genetically predisposed to Alzheimer’s: ‘It affects the rest of your life’

Chris Hemsworth has made a significant discovery.

While filming his National Geographic docuseries, Limitless, the actor, 39, learned he had a greater-than-average chance of developing Alzheimer’s after finding out he has two copies of the gene APOE4, which is linked to an increased risk of the neurodegenerative disease.

“They took all my bloodwork and did a bunch of tests and the plan was to on-camera tell me all the results and then talk about how you can improve this and that,” Hemsworth told Vanity Fair of the fourth episode, entitled “Memory,” in which a doctor tested him and told him the news on camera.

Upon hearing the news, the Thor star said he had a hard time navigating what to do with the information.

“Most of us, we like to avoid speaking about death,” he explained. “Then to all of a sudden be told some big indicators are actually pointing to this as the route which is going to happen, the reality of it sinks in. Your own mortality.”

Hemsworth says his grandfather is currently living with the disease. While he hasn’t seen him in a few years, he’s relied on family members to provide updates on his health.

At one point, Hemsworth says the doctor who gave him the test was concerned about delivering his results on camera. The actor was even “offered a version of the episode where we didn’t talk about it,” but after considering how it may help others, he decided to approve the scene.

“My concern [with the episode] was I just didn’t want to manipulate it and overdramatize it, and make it into some sort of hokey grab at empathy or whatever for entertainment,” Hemsworth said. – Source