Chocolate Milk

For some unknown reason Southern Man has had, for the last two weeks, an unrelenting craving for chocolate milk. Every workday on his way from the day to the evening job he stops by the store for a quart or even half-gallon of chocolate milk. Nothing else will do. It must be chocolate milk. At home he wakes up at two in the morning and goes to the kitchen and mixes up a big glass of chocolate milk. This happens almost every night. So what are they putting in the chocolate milk these days that has him addicted? Inquiring minds want to know!