Then I read the ingredients. The second item (after water) is High Fructose Corn Syrup, the ingredient which is widely blamed for making the population of the United States so obese.
The process by which HFCS is produced was first developed by Richard O. Marshall and Earl R. Kooi in 1957. The industrial production process was refined by Dr. Y. Takasaki at Agency of Industrial Science and Technology of Ministry of International Trade and Industry of Japan in 1965-1970. HFCS was rapidly introduced in many processed foods and soft drinks in the US over the period of about 1975–1985.
So not really very natural at all, then.
I found this rather amusing chart at GraphJam (see right).