I’ve awarded the coveted #1 Worst Drink spot to regular sodas that contain insane amounts of sugar and sweeteners.
Diet soda is generally not a good thing to drink because it’s basically artificially sweetened water, and we don’t really know what affect these artificial sweeteners may have on humans in the long run, but it’s still better to drink than regular sodas.
Juice is not the greatest drink either, very high in natural sugars which while better than artificial, are still not great to be consuming a ton of.
With all drinks, it’s way too easy to consume a ridiculous amount of calories (go look up some Starbucks drink information, for instance a regular grande mint mocha frappuchino with whipped topping contains almost 500 calories, that’s one quarter of the average daily recommended intake of 2000 calories), and as with all other foods, if you’re eating more calories than you need to use in a day, your body will save that energy in the form of fat.
That’s why it’s great to develop a love (or at least tolerance) to drinking water throughout the day – it’s what your body wants, and contains no calories. Simply swapping out your regular drink for water will generally result in a few pounds of weight loss by the average cola/juice/Starbucks-drinking person.