I think this actually suffers from selection bias. To be a taxi driver in London is not just simply applying for for the job and trying it out. You have to pass

I think this actually suffers from selection bias. To be a taxi driver in London is not just simply applying for for the job and trying it out. You have to pass a very difficult memory test to be a taxi driver in London. So the study might be testing out people who have extremely good memories to begin with and might be less likely to suffer from Alzheimer’s genetically. So I’m wondering if this would still be true if it was tested on taxi drivers in New York City. But my other theory, if this is not true, is that because they are now seeing Alzheimer’s as being a problem of glucose transport , and Since using your memory uses energy in the brain, this would lower overall glucose in the brain and protect it from developing all Alzheimer’s. Or maybe like I said before that these people who can pass these taxi driver test already have excellent glucose transport in the brain which enables them to memorize the streets of London so much easier.