When you’re training, go easy on the soft drinks in your sports nutrition diet. There has been some indication that drinking a lot of carbonated sodas, especially cola, can have an adverse effect on bone strength, especially in teenage girls. (This would probably also be true of diet sodas.)
Although very controversial and far from proven, there is no doubt that carbonated drinks alter your body´s pH levels. The fact that many people, especially teenagers, consume a large percentage of their calories as soft drinks, which have no nutritional value and displace a proper sports nutrition diet, should make you think twice about drinking a lot of soda. You don´t have to give up soda; just don´t make it a major part of your sports nutrition diet.