For many of us, the reason we're overweight or obese isn't down to what we're eating -- it's down to what we're drinking. Soda, alcohol, juice, smoothies, lattes -- these are all major sources of calories, yet we don't think of them that way because we don't sit down with a knife and fork to eat them. CNN has done a report on this as part of their America's Killer Diet feature.

Keep in mind that drinks have a lot of calories. A large soda with your burger and fries has about 400 calories -- that's more than the fries! A syrupy sweet coffee drink from Starbucks can have upwards of 250 calories. And beer? 160 calories a bottle. For more calorie counts, check out this post on Fitbuff.

Here's a challenge: Quit the juices, the soda and the booze for a week and see if you lose any weight as a result. Drink water and tea instead and eat as you normally would. I bet you'll notice a difference -- if not in your weight, in your energy at least.