Popeye may have been on to something eating all that spinach.
Researchers at Rush University in Chicago found that pensioners who regularly ate one or two portions of green veg - such as spinach or kale - experienced a less significant decline in cognitive function than those who didn't.
Participants had an average age of 81 years, but hose who ate one or two portions of green veg per day were found to have a brain age that was 11 years younger than their actual age.
The scientists evaluated the diet and mental ability of around 950 older people to draw their conclusions.
Participants were monitored for a minimum of two years and a maximum of 10 years.
Factors such as family history of dementia and exercise were taken in to account, but the veg-eating participants were still found to have an overall younger brain age than the non-veg eating ones.
“Losing one’s memory or cognitive abilities is one of the biggest fears for people as they get older," lead researcher Martha Clare Morris commented on the study.
"Since declining cognitive ability is central to Alzheimer’s disease and dementias, increasing consumption of green leafy vegetables could offer a very simple, affordable and non-invasive way of potentially protecting your brain from Alzheimer’s disease and dementia.”
This isn't the fist study to suggest green vegetables can help keep the brain young and healthy.
A previous study from The University of California San Francisco made a link between anaemia and dementia.
The researchers found that people with anemia were more likely to develop brain degenerative conditions such as Alzheimer's disease, than those who were not anemic.
Therefore, they concluded, eating iron-rich foods such as spinach to combat anemia can also reduce the risk of brain degenerative conditions.