Korean researchers recently published a study in the Journal of the American College of Nutrition showing a link between what we eat and our emotional state.
The researchers studied the nutritional habits and emotional states of over 200 school children. They collected nutritional data from food questionnaires and dietary checklists, Emotional state data had been gathered through depression and anxiety questionnaires, electroencephalograph, and heart rate measurements.
What the researchers discovered was that those who consumed processed foods were more likely to have poor emotional scores, and those who are natural foods (such as legumes and fruit) were more likely to have good emotional scores.
This is yet one more study in an every-growing list of studies showing a positive connection between our diet and our mental health.