It's in everything--high fructose corn syrup. This is a sugar that exists in nature which man has figured out how to produce cheaply in large quantities, and at a great expense. One new study shows that the more high fructose corn syrup (HFCS) you eat, the more food you want to eat. The authors concluded that "The fact that fructose metabolism by the brain increases food intake and obesity risk raises health concerns in view of the large and increasing per capita consumption of high fructose sweeteners, especially by youth." It is likely that soda makers and other marketer's of HFCS know that the products make you eat more, and that is precisely why they use them--the more you eat, the more you want. Read the study here.
Another study that just came out demonstrates that consuming a diet high in fructose for just seven days causes "ectopic lipid deposition in liver and muscle and fasting VLDL-triacylglycerols and decreased hepatic insulin sensitivity." This means that fat is deposited in the liver and in muscle where it shouldn't be, and that the riskiest type of cholesterol changes occur, and that insulin resistance begins. This is the beginning of the road to diabetes, heart disease, fatigue, and other chronic illness. Read the study here.
I suggest eating sugars in moderation, and only in there natural form; agave nectar, molasses, maple syrup, and fruits are good alternatives to precessed sugars. And, quit eating high fructose corn syrup!