Actor Chris Hemsworth says he is taking a break from acting after learning he has a heightened risk of developing Alzheimer’s disease.

The Thor star learned that he has two copies of the gene ApoE4, one from his mother and one from his father, making him between eight and 10 times more likely to develop the disease than those without both copies of the gene.

Hemsworth made the discovery after undergoing tests as part of his Disney+ documentary series Limitless, adding he will now be trying to take “preventative steps”.

Alzheimer’s is the most common form of dementia and can cause memory problems, confusion and communication issues.