Chris Hemsworth has shared how he experienced a 'gear shift' in his motivations after finding out he was 10 times more likely to develop Alzheimer's disease than an average person. Loading audio...

The Marvel actor discovered that he carries two copies of the APOE4 gene, which makes a person eight to ten times more likely to develop the disease, whilst filming season one of Limitless: Live Better Now.

Hemsworth had taken part in the National Geographic show to face new experiences that challenge the body and the mind when he took a genetic test that revealed the news.

Research has shown that nearly all double carriers of the gene showed key early signs of dementia by the age of 55.

He spoke to Sky News about the moment he found out he had two copies: "It was just kind of this point i

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