Researchers at Georgia State University have found that diets high in fructose — a type of sugar found in most processed foods and beverages — impaired the spatial memory of adult rats. They placed rats in a pool of water to test their ability to learn to find a submerged platform, which allowed them to get out of the water. They then returned them to the pool two days later with no platform present to see if the rats could remember to swim to the platform’s location. Those rats on a fructose diet can’t remember as well where the platform was when you take it away. They swam more randomly than rats fed a control diet.

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See also this story on high fat diets and memory loss.