And last reason ,Frequent consumption of soft drinks may also increase the risk of osteoporosis, especially in people who drink soft drinks instead of calcium-rich milk. High soda consumption particularly in children poses a significant risk factor for impaired calcification of growing bones. In the 1950s, children drank 3 cups of milk for every 1 cup of sugary drinks. Today that ratio is reversed: 3 cups of sugary drinks for every cup of milk. Tellingly, osteoporosis is a major health threat for 44 million Americans. Most experts now say that the real culprit is soda's displacement of milk in the diet, though some scientists believe that the acidity of colas may be weakening bones by promoting the loss of calcium.