Recently, i've noticed that my boyfriend seems relatively shorter than he used to be about a year ago, and we found out that he has gone from being 6'2" to 5'11"! I was wondering if it's possible that osteoporosis could occur in teenagers (he is 19 years old), and what might cause it. A theory of my mom's is that he drinks too much pop (about 3-4 cans a day) and that it can result in the loss of bone density, but i'm not sure whether that could be possible. Any help would be much appreciated!