In an article by Joy Bauer, she suggests that eating certain foods and how long you wait between meals directly affects your mood.
The next time you feel blue or irritable, you may want to take a look at what’s in your fridge. Researchers who study the food-mood connection have found that certain vitamins and other compounds in food can change brain chemistry. Foods influence the activity of neurotransmitters, the chemicals that convey information from one neuron to the next. Anything that affects these chemical messengers affects your mood—making food a pretty powerful “drug” when it comes to how you feel and act.
A hungry brain is an unhappy brain. Try eating every four to five hours and see how much better you feel.