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#9 - High blood cholesterol levels are bad for the heart.

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I feel that both A and D strengthens the argument to the same degree. My interpretation of the stimulus is thus: High cholesterol is bad for the heart. Shellfish belongs in a group of food that contains cholesterol. But unlike others in the group, it is not necessarily bad for the heart. The reason is that saturated fat affects blood cholesterol far more than dietary cholesterol does, and that shellfish is very low in saturated fat.

I think that A strengthens the argument because what is implied in the "but" is that unlike meat, eggs, and poultry, shellfish is not necessarily bad for the heart. This of course means that meat and eggs are bad for the heart. Since the level of dietary cholesterol is insignificant for determining blood cholesterol levels as compared to saturated fat, the only way that meat and eggs, unlike shellfish, could be bad for the heart (i.e. could induce high blood cholesterol) is to be high in saturated fat. Please tell me where is a problem in my reasoning. Thank you in advance for replying.
Adam Tyson
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I think your interpretation of the "But" at the beginning of the second sentence (which is the conclusion of the argument) is not entirely justified. It doesn't imply that meat, etc., must be bad for the heart. All we know about them is that they are high in cholesterol. The "But" just means that shellfish may be high in cholesterol, "but" they are not bad for the heart.

A doesn't strengthen the conclusion that shellfish aren't bad for the heart - it only supports a conclusion that meat and eggs MAY be bad for the heart. We aren't trying to prove that shellfish are different from meat and eggs, only that shellfish aren't bad. D gives us additional support for that conclusion.

Hope that clarifies it for you!

Adam M. Tyson
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Adam M. Tyson
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