What happens to your body when you eat junk food

We've all been there—that moment when junk food is either the only option, or the option we simply can't resist. 

Well, there is actual science behind this appeal. There are many reasons why fast food is so irresistible. From the ingredients, to the texture and flavors, junk food lures us into craving more and sometimes even becoming addicted to it. 

But how harmful is it to eat junk food? What actually happens to your body when you bite into a heavily-processed burger? 

Click through the gallery to find out!