Most milk packs a nutritional punch and contains protein, calcium, phosphorus, vitamins A and D, LACTOSE (milk sugar) and riboflavin. On the minus side, milk's natural sodium content is quite high. Most milk sold in the United States today is PASTEURIZED, which means the microorganisms that cause diseases (such as salmonella and hepatitis) and spoilage have been destroyed by heating, then quick-cooling, the milk. Pasteurization eliminates the possibility of disease and gives milk a longer shelf life. Most commercial milk products have also been HOMOGENIZED, meaning that the milk fat globules have been broken down mechanically until they are evenly and imperceptibly distributed throughout the milk. The end result is that the CREAM does not separate from the milk and the liquid is uniformly smooth.