Why is Keyes so grumpy?

Why is Keyes so grumpy? It may be the low-carb diet.

Researchers at the Massachusetts Institute of Technology say complex carbs, such as potatoes, rice, whole grain breads, lentils, beans and pasta, are best for stabilizing mood. So if you are already prone to mood changes, a low-carb diet may make you cranky. Judith Wurtman, Ph.D., a research scientist in MIT's Department of Brain and Cognitive Science, says low-carb diets can inhibit the synthesis of brain serotonin, which is made after the consumption of carbohydrate foods. "Many people eat carbs as a form of self medication because, as we discovered years ago, the resulting increase in brain serotonin improves mood. We call these people carbohydrate cravers and without carbs, they tend to feel very grumpy, angry and even anxious. They experience symptoms similar to PMS," she says.

The Lowdown on Low Carbs (Same info here)