Overeating will do more than just widen our waistlines. A new study shows that eating too many calories also hurts our memory. Here are the details:

Researchers at the Mayo Clinic asked more than a thousand seniors questions about their diet, then gave each volunteer a series of MRI scans and cognitive tests to evaluate how well their brains functioned. They were specifically looking for symptoms of mild cognitive impairment, or MCI, which is how neurologists describe the stage between normal, age-related memory loss, and Alzheimer's disease.

The result: compared to people who ate the fewest calories each day, they found that the senior citizens who ate the most were twice as likely to have MCI.

So why is overeating linked to memory loss? A few factors are at play.

First, overeating is related to diabetes and heart disease, which is in turn related to the risk of dementia. And eating too much inflames your arteries, which has been linked with lower cognitive function.