Sugar not only makes you fat, it may make you sick
http://thechart.blogs.cnn.com/2014/02/03/sugar-not-only-makes-you-fat-it-may-make-you-sick/?hpt=hp_t2
This is interesting because the evidence is building up that refined sugar (and be sure to always include refined starches (such as refined flour)!) is actively bad for your health in the amounts any normal member of our society consume. I have mentioned ‘evil’ sugar before (you should also read the links in that post if you haven’t already), it is getting to the point that I think excess refined sugar/starches are worse for you than smoking and I believe the science on the evils of smoking are quite well established (but note: smoking is far from a death sentence! it may only slightly increase your chance of dying by any other means), though it will no doubt be decades before the sugar producing industry will acknowledge that.
Bottom line: if you can afford it, try to keep the total calories in your diet from refined sugar/starches to under 10%, ideally under 5%. What does that mean? If you ate nothing but unrefined food (salads, steak, fish, etc.; no pasta, rice, etc.) then you could have a _single_ 16 ounce soda. Pretty amazingly different from the average Jill and Joe diet eh?