We have all heard that sugar is bad for us, fat is bad for us, and fiber is very good for us. Is it that simple? No, not really. There are different types of sugars & fats, of which some are necessary, and some are to be avoided. Fructose (found in white sugar and HFCS) is bad, unless paired with fiber, because you can eat lots of fructose, but without the fiber, the body doesn’t know that you are getting filled up. The short answer is “eat fruit, don’t drink soft drink”.
For a more complete explanation of the roles that sugar, fat, cholestoral and fiber play in our bodies digestion and utilization, see http://lifehacker.com/5809331/what-sugar-actually-does-to-your-brain-and-body