A five-year study of more than 2,500 middle-aged people in France found a possible connection between weight and brain function, named as the "Homer Simpson syndrome". Results from a word memory test showed that people with a BMI of 20 (considered to be a healthy level) remembered an average of 9 out of 16 words. Meanwhile, people with a BMI of 30 (inside the obese range) remembered an average of 7 out of 16 words.