Though that's part of the story. Bad science in the food and nutrition industries and vested interests more interested in making money than anything else are also to blame.
I found this with a simple Google:
http://diabeticmedit...ugar-consumption/
More information is in Sweet Poison http://www.goodreads...ugar-makes-us-fat and Big Fat Lies http://www.goodreads...9011-big-fat-lies
Wade.