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In another clip, Hemsworth reflects on his grandfather's battle with Alzheimer's and talks about how hard it is.

\"He is a beautiful man,\" Hemsworth said. \"He either doesn't remember who we are, you know, his grandchildren, but also even his own children he forgets. It's heartbreaking.\"

Research shows that developing the disease is more likely for those who do have a first-degree relative with Alzheimer's, but having a parent or sibling with Alzheimer's does not always mean that someone will develop it.

\"PHOTO:
Lisa Maree Williams/Getty Images, FILE
PHOTO: In this June 11, 2022, file photo, Chris Hemsworth arrives at an event in Sydney, Australia.
>

Path to preserving brain health

While Hemsworth is met with the life-altering news in the show, a doctor in one clip points out that the learned information is a blessing and can help motivate Hemsworth to look after his brain health.

\"It's my belief that if we take every step possible, we can reduce your risk to that of anyone else,\" Attia tells Hemsworth in a clip.

There is currently no cure for Alzheimer's disease, but the Centers for Disease Control and Prevention says there are ways to reducing the risk of Alzheimer's, including regular exercise, managing blood sugar and maintaining a healthy weight. Other ways that the CDC says Alzheimer's can be prevented include quitting smoking, avoiding excessive drinking and getting enough sleep.

\"It very quickly just became another wonderful motivation to make some changes and arm myself with all the tools to live a healthier, better life,\" Hemsworth said while appearing on \"Good Morning America.\"

He continued, \"I think any of the motivations for living better can come in many shapes and forms and this was, you know, whatever I'm going to do now to benefit and protect myself from brain health will benefit every aspect of my health and well-being.\"

“It very quickly became another wonderful motivation to make some changes and arm myself with all the tools to live a healthier, better life.” — @chrishemsworth on learning about his risk of developing Alzheimer's disease during his @NatGeo show, #LimitlesswithChrisHemsworth. pic.twitter.com/21RPRrqLNr

— Good Morning America (@GMA) November 17, 2022

\"Limitless\" is now available to stream on Disney+.

Disney is the parent company of ABC News and \"Good Morning America.\"

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