I read an interesting article in National Geographic awhile back, slave trade originally really took off to work on tropical sugar plantations.
A hundred years ago plus the average american consumed about 5-6 pounds of sugar a year, now we consume well over 150 lbs a piece of sugar. Look at the ingredients in something as simple as ketchup, somewhere in there is added sugar. I've been to England several times now and I think the reason most of them stay slimmer is not all the walking, bike riding or smaller meals, as I can't even begin to finish a English breakfast, but it's the fact they don't have all the added crap in their food. Ketchup over there will have tomatoes, water, vinegar and spices, all the ingredients can be pronounced and they just use better tomatoes instead of adding sugar.