Chris Hemsworth has told Sky News that finding out he had a greater chance of developing Alzheimer's disease was a "gear shift" in his life motivations.

During a genetic test in season one of Limitless: Live Better Now, the Australian actor discovered that he is, biologically, eight to 10 times more likely than others to have the brain disorder during his lifetime as he carries two copies of the APOE4 gene.

He had first taken part in the National Geographic show to be its "guinea pig" and face new experiences that challenge the body and mind.

But after having the test, the 41-year-old Thor, Furiosa and Transformers star was faced with an unexpected truth.

Image: Reuters file pic

One in every 50 people inherit two copies of the APOE4 gene and research has found that nearly all double

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