Recently, a growing body of research suggests that the brain fog one experiences as they grow older is linked to a tide of inflammation deep within the brain’s memory centre. Scientists call this “neuroinflammaging” – thought to be the inevitable price of growing older.

But now, a new mice study suggests that this inflammation behind brain ageing and brain fog can actually be reversed with a simple nasal spray. This spray could reshape the future of therapies for conditions like Alzheimer’s disease, and may even change what is known about brain ageing itself, say researchers from Texas A&M University.