Chris Hemsworth, star of the "Thor" films, has spoken publicly for the first time about how his life has changed since learning he has a genetic predisposition to Alzheimer's disease.

On the National Geographic documentary series "Limitless," Hemsworth, 40, shared that he has two copies of the gene APOE e4, which is linked to a higher risk of developing Alzheimer's.

He admitted that the diagnosis "floored" him and that he had been living under the assumption that he would live forever.

Since then, he has made changes to his workout routines and focused more on his brain health.

In an interview with Men's Health, he said he was 'incorporating more solitude into his life.'

'I've always been pretty consistent with my exercise commitments, but lately I've really felt the importance of taking time for yourself without any outside voice or stimulation and making time for stillness,' explained.