Loss of smell is a warning sign of Alzheimer’s. What if you lose your sense of smell from Covid?

One of the stranger symptoms of Covid — the loss of the sense of smell — is a symptom that, well before the pandemic, was considered to be a warning sign for dementia. 

The big question for researchers now is whether Covid-related loss of smell might also be associated with cognitive decline. Around 5 percent of Covid patients worldwide — some 27 million people — have reported loss of smell lasting more than six months.

New preliminary findings presented Sunday at the Alzheimer’s Association International Conference in San Diego suggest there may be a link, though...