Answers are in
bold.
1. In the passage, the author is primarily interested in
(A) proposing a solution to a health problem.
(B) recommending a particular nutritional plan.
(C) discrediting an erroneous belief.(D) evaluating the benefits of a dietary regimen.
(E) criticizing the shortcomings of modern diets.
Explanation of question 1The passage is a short one and here the author starts of saying that many diets are based on dubious assumption. The moment we encounter the word dubious, we are sure that the author does not agree with popular "diets". Then the author goes on describing a lot of jargon about LDL and oxidation and so forth, which we are not really bothered too much about. The only point we have to understand is what the author intends to convey. The use of words like "however" and "furthermore" helps us understand the structure and the flow of author's argument. Anyways to cut a long story short, he ends by saying most diets fail. Cool now lets look at the answer choices
A - author does not propose any solutions, he merely points out the problems.
B - if anything, he recommends not to follow diets as they may pose risk to humans.
C - he discredits the erroneous belief that increased consumption of meat and meat by-products pose minimal health risks to the human body. But as yourself, is this really what the author is primarily interested in? I think yes. Check the passage again. He discredits this. Then the next sentence he says why the people who favour this think so. And then comes up with his own argument and proves how LDL levels are increased indirectly. HE goes on saying there is a positive correlation between consumption of saturated animal fats and the oxidation of LDL. See what I did there? Yes this is our answer.
D - he primarily describes why diets do not work. He is not evaluating the benefits of a particular diet.
E - this is a close choice, and the author does believe many of the most popular diets are bad. Are these shortcomings of modern diets? Sure. Is that the central idea of passage? No.
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2. Which one of the following most accurately states the main point of the passage?
(A) Increased consumption of meat and meat by-products may be harmful to one’s health.(B) Cholesterol intake can exacerbate the negative effects of saturated fatty acids on LDL concentrations.
(C) Most diets are not as healthful as their proponents are led to believe.
(D) Although cholesterol intake is not directly responsible for increasing the concentration of LDL particles in the blood plasma, it can cause such an increase indirectly.
(E) The healthiest diets are those that eliminate meat and meat by-products.
Explanation of question 2We discussed in details in answer 1 what the main idea of the passage was. So we can go straight to the answer choices
A - Do not need to go into the details of this as already discussed in q1, but yes this is the central idea of the passage. What is more interesting to understand why the next closest choice is NOT the answer. (the closest choice is C)
B - Too narrow
C - close choice, but not the answer. Why? Because the usage of the term MOST is incorrect. The author is of the opinion that many of most popular diets are bad. MOST POPULAR not MOST DIETS. There is a huge difference in meaning. Therefore this is not our answer.
D - Very specific
E - No, the author never mentions or implies this. He just says that modern diets that have meat in them are not good as most believe.
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3. Which one of the following most accurately describes the role played in the argument by the claim that cholesterol intake does not directly correlate with the concentration of harmful low-density lipoprotein (lines 6-8)?
(A) It is a claim on which the argument depends but for which no support is given.(B) It is used to refute the causal explanation described by the conclusion of the argument.
(C) It summarizes a position that the argument as a whole is directed toward discrediting.
(D) It acknowledges a possible objection to the recommendation put forth in the argument.
(E) It is a proposition for which the argument seeks to advance a causal explanation.
Explanation of question 3Author says that proponents of diets based on the dubious assumption observe that cholesterol intake does not correlate with LDL concentration. These are always tricky to answer. The main thing we can do is understand which one is our argument (just discussed) and look at the choices
A - it is a claim, yes. The argument depends on it, also yes. Is there any support for this claim? No. Looks good till now.
B - claim is used to refute the causal explanation
C - claim does not summarize a position.
D - claim helps to reason out the argument, not object it.
E - the claim is not a proposition. Furthermore, I cant locate any causal explanations here.
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4. Which one of the following, if true, would most strengthen the proponents’ argument that increased consumption of meat and meat by-products pose minimal health risks to the human body?
(A) Excessive consumption of salt, often found in meat by-products, is associated with increased risk of cardiovascular disease.
(B) Some animal fat contains large amounts of omega-3 fatty acids, which mitigate the ill effects of increased LDL concentrations.(C) Of all plant-based diets, those that exclude meat and meat by-products are the most protective against atherosclerosis.
(D) Drugs that lower cholesterol levels can also prevent cardiovascular disease, but carry the risk of adverse side effects.
(E) Antioxidants and dietary fiber are not the only substances that can prevent oxidative modification of LDL.
Explanation of question 4We have to strengthen a view point (not the author's viewpoint) that increased consumption of meat pose minimal health risk.
A - This weakens it. It increases risk.
B - okay mitigating ill effects of LDL, I am already liking this. Animal fat is an animal by-product. SO we can say increased consumption of meat by-products (animal fat) pose minimal health risks - because it mitigates the harmful LDL. Looking good!!
C - Not sure what this is, but from the context it is a BAD thing for humans! So this weakens it right, because it says the diets not having meat protects us against a BAD disease.
D - I appreciate this information whole-heatedly but will never use this in my life. In fact I wont be able to use this information in this question as well. Nothing against you choice D, but you are irrelevant to wither strengthen or weaken the viewpoint. Are those drugs made of animal by-products - well nothing is mentioned. Pretty useless choice.
E - Similar to D, this does not help us link the two - consumption of meat TO minimal health risk.