Tree worship, perhaps a distortion of the tradition of the tree of life and the tree of knowledge (Genesis 3), may be traced in Egypt, Arabia, Syria, Assyria, Persia, India, Thibet, Siam, China, Japan, Ceylon, the Philippine isles. The Druids venerated oak groves (Pliny, H. N., xvi. 44; Tacitus, Annals xiv. 30).
It does contain more calories than regular milk, mostly because of the chocolate content. A good compromise is to make your own chocolate milk by mixing in chocolate syrup or cocoa to skim milk. This way, you'll get maximum health benefits while still enjoying the flavor of chocolate milk.
Milk chocolate is traditionally made with innocuous, low-acid cocoa beans compared to dark chocolate, which makes a mellow but blandly sweet bar. But many of today's small-batch producers (as well as a few top-notch big guys) have turned to more flavorful beans that highlight the chocolate's intensity.