Crabby? Eat some oatmeal.

Oatmeal is rich in soluble fiber. Soluble fiber slows the absorption of sugar in the blood, which in turn smooths out your blood sugar levels, which in turn makes you less cranky.

Another benefit- it forms a gel in your stomach which slows the emptying of food from your stomach. This slows the feeling of hunger.

Wilford Brimley- you are wise beyond your many years, my friend.

Source: This site, which I just stumbled upon.