Final answer:
The statement 'such as boxed macaroni and cheese, which are yummy but really not good for you' is considered fluff because it adds subjective opinion rather than factual information to the discussion on processed foods. .
Therefore the correct answer is option OB such as boxed macaroni and cheese, which are yummy but really not good for you.
Step-by-step explanation:
The clearest example of fluff in the passage provided is the statement 'such as boxed macaroni and cheese, which are yummy but really not good for you'. This piece of information offers a subjective opinion and does not contribute substantial facts to the argument about the health implications of processed foods. On the other hand, statements about the links between processed foods and health conditions such as diabetes and obesity, and the presence of additives like Butylated hydroxytoluene (BHT) and Butylated hydroxy anisole (BHA) provide factual concerns backed by research.
A diet high in processed foods often leads to increased risks for health problems due to high levels of sugar, salt, saturated and trans fats, and may lack necessary nutrients. Relying heavily on processed foods for convenience could result in both undernutrition and overnutrition, potentially contributing to health issues like heart disease, cancer, and type 2 diabetes.