Do higher glucose levels affect your ability to remember and learn new words? German researchers in Berlin say, yes, they do. The 141 Berliners in the study were asked to remember words (presumably German words) for different lengths of time. Those who had higher blood sugar levels remembered fewer words than those with lower blood sugar.
The volunteers were all within what is commonly called the “normal” range of blood sugar. Even within that “normal” range, people with higher average blood sugar remembered less well than people with lower average blood sugar.