Soda has gotten the bad rap from nutritionists for a long time. Experts say the amount of sugar in each can or bottle contributes to a higher risk of heart disease and diabetes.

Now, two U.K. researchers are saying that even natural, no-sugar-added fruit juice is a bit more than a sugar delivery system that's almost harmful as soda.

In the journal Lancet Diabetes and Endocrinology, researchers compared the nutritional stats of apple juice with those of a can of cola. About one cup of apple juice has 110 calories and a shocking 26 grams of sugar. These calorie and sugar counts are almost similar to what you'd find in the same size serving of cola.

The researchers also cited previous research linking regular consumption of grape juice to increased insulin resistance. Researchers wrote that it offsets any nutritional benefit offered by the vitamins and minerals in fruit juice, researchers wrote.

Researchers are now suggesting that a cup of fruit juice no longer count as one of the five servings of fruit and vegetables you're supposed to take each day. They're also calling for warning labels on fruit juice containers, which would clue consumers in to the high calorie and sugar counts.