Processed foods make up 50 percent of the current american diet. though they are inexpensive and convenient, especially when you are in a hurry and just don't have time to make dinner from scratch, processed foods are unhealthy and contribute to a variety of health problems. a diet high in processed foods such as boxed macaroni and cheese, which are yummy but really not good for you, has been linked to both diabetes and obesity. processed foods are also sources of butylated hydroxytoluene (bht) and butylated hydroxyanisole (bha), two chemical additives that sound very scary and which are known to cause cancer in humans. which excerpt from the passage is the clearest example of fluff?