Official Solution:
Public health officials have long recommended that people consume low-fat diets to decrease the risk of heart disease. Extensive nutritional studies have shown that fats are more calorie-dense than carbohydrates or proteins. If, as many nutritionists believe, [b]calories are the primary contributor to weight gain and thus to heart disease, then by encouraging a low-fat diet,
public health campaigns can effectively reduce the incidence of heart disease. However, recent research suggests that not all fats are harmful and that some, like those found in nuts and fish, are actually beneficial for heart health.
In the argument above, the two portions in bold play which of the following roles?
[/b]
A. The first is a longstanding universal theory in nutritional science; the second is a conclusion universally endorsed based on this theory, which the argument rejects
B. The first is the conclusion that the argument seeks to establish; the second is a premise that is used to support this conclusion.
C. The first is a belief used to support a public health recommendation; the second is a conclusion based on that belief but subsequently challenged in the passage.
D. The first is a belief held by many nutritionists that the argument aims to refute; the second is a strategy based on this belief that the argument suggests is flawed.
E. The first is a claim that the argument questions; the second is the position that the argument advocates.
(C) Correct. The first is a belief used to support a public health recommendation; the second is a conclusion based on that belief but subsequently challenged in the passage.
The first bolded portion, "calories are the primary contributor to weight gain and thus to heart disease," provides a rationale for recommending low-fat diets. It is a belief used to support the public health recommendation, not a conclusion that the author is trying to establish. Identifying this logical relationship does not require assuming that the public health officials are themselves nutritionists.
The second bolded portion, "public health campaigns can effectively reduce the incidence of heart disease," states the expected effectiveness of the campaigns promoting low-fat diets. This is a conclusion drawn on the basis of the calorie-related belief. The passage then introduces research about the benefits of certain fats, giving a reason to question whether reducing fat consumption will have the expected effect.
The key distinction is between challenging a conclusion drawn from a belief and refuting the belief itself. The author does the former. The research introduces a complication for the recommendation; it does not establish that the belief about calories is false or that low-fat diets cannot reduce heart disease risk.
(A) The first is a longstanding universal theory in nutritional science; the second is a conclusion universally endorsed based on this theory, which the argument rejects.
This choice overstates the extent of agreement. The passage does not establish that either the belief or the conclusion is universally accepted. A belief can support public health recommendations without being a universal theory, and a recommendation can be adopted without its expected effectiveness being universally endorsed.
(B) The first is the conclusion that the argument seeks to establish; the second is a premise that is used to support this conclusion.
The first statement is not the author's intended conclusion, and the second is not evidence supporting it. Instead, the first supplies support for the second, which the author subsequently challenges.
(D) The first is a belief held by many nutritionists that the argument aims to refute; the second is a strategy based on this belief that the argument suggests is flawed.
The decisive error is the claim that the argument aims to refute the first belief. The finding that some fats benefit heart health does not establish that calories are not the primary contributor to weight gain and thus to heart disease. Those propositions can coexist. The author challenges the inference about the campaigns' effectiveness, not the underlying belief itself. Also, promoting low-fat diets is the strategy; the second bolded portion states a conclusion about that strategy's expected effectiveness.
(E) The first is a claim that the argument questions; the second is the position that the argument advocates.
The author does not advocate the second statement. Rather, the passage introduces evidence that calls it into question. This choice therefore misidentifies the author's position toward the second bolded portion.
Answer: C