It’s a cola with an artificial sweetener. There’s lots of misinformation out there about diet soda. It mostly passes through you, unlike regular soda which has lots of sugar that your body stores as fat. Not to say either one is healthy because it most certainly is not. However, phosphoric acid in cola (both regular and diet) can lead to an increased risk of kidney stones. In case anyone is wondering I do not work for big soda, I’ve just read way too much about this topic. That being said please drink more water. Unsweetened tea or black coffee is also acceptable. Anything is fine in moderation. Soda is supposed to be a treat enjoyed once in a while, now it’s a mass market product that is way too accessible. And no diet soda does not cause cancer, please stop citing a garbage study that has been disproven every subsequent trial.