DEAR DOCTOR K: I love diet soda, but I've been hearing that it's not good for me. Is it so bad that I should stop drinking it?
DEAR READER: The introduction of sugar-free sodas (or "soft drinks") decades ago seemed like a blessing. Now you could enjoy the flavor, carbonation and caffeine of soda without the calories and weight gain. (Not to mention the diseases that go along with obesity, such as diabetes and heart disease.) What's not to like? I surely believed it: I've been drinking a diet soda nearly every day and avoiding sugary drinks for 30 years. But there are growing doubts about whether diet sodas really help people lose weight and avoid diabetes.