Check Your: Eyes For: Cognitive decline.

In a study, people as young as 38 who had wider blood vessels in their eyes scored worse on IQ tests than those with smaller veins, according to Duke researchers. The veins in your eyes are similar in size, structure, and function to your brain’s vessels, so your peepers could indicate a decline in brain health years before the onset of dementia. It’s not so easy to spot the change yourself, so make a yearly appointment with your eye doc.