Paragraph 3 discusses the benefits of a balanced diet for overall health. Which of the following sentences, if added to Paragraph 3, would be LEAST relevant to the paragraph's main point?
Correct: C
The paragraph's main point is the benefits of a balanced diet. Options A, B, and D all directly support this point. Option C discusses the failure of diet trends, which, while related to diet, does not specifically highlight the *benefits* of a balanced diet and thus is least relevant to the paragraph's stated focus.