The effects of sugar, in particular, "fructose" can take your body down a vicious cycle known as metabolic syndrome.
UC Davis' Kimber Stanhope altered the diets of a group of volunteers for her study. Instead of her subjects eating food like rice, pasta or bread, she had them consume a sugary beverage. The effects on the body started in the liver and from there Stanhope explains how that set off a chain of responses in the body.
Quitting problem foods is so much easier when you understand just exactly whats going on inside your body.
Read more about fructose and other sugars here: The Case of Sugar