So is the conclusion that a cupful of sugar will cure depression? My girl friends depression was severe when we were on a low-fat (high carb) diet. She is immensely improved since we switched to low-carb diets. We also both noticed that we are much more energetic and no longer feel that we want to take naps in the afternoon.

There have been many studies that show eating excessive carbohydrates can increase serotonin, but they usually don't mention the side effects, such as rapid weight gain.