Logical ReasoningDifficulty: Easy

PT137 S4 Q3 Explanation

Consumption of sugar affects

A free, expert breakdown of this official LSAT Logical Reasoning question.

TopicsParadox

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Stimulus

Consumption of sugar affects the level of unmetabolized sugar in the blood; the level rises following consumption of sugar. Yet people who consume large amounts of sugar tend unmetabolized sugar in their blood.

What this question is testing

Paradox

Your task

Break the argument into its conclusion and evidence, then do exactly what the question stem asks with that structure.

Common trap

Answers that sound relevant to the topic but don't connect to the argument's actual reasoning.

Winning move

Predict what a right answer must do, then test each choice against the conclusion-evidence gap.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
3.

Which one of the following, if true, helps most to resolve the apparent

Answer choices

  1. Unclear Impact: overweight1% picked this

    Persons who are overweight tend to have below-average levels of unmetabolized sugar

    It's not clear what significance we could get from knowing that overweight people tend to have low blood sugar. Do overweight people consume large amounts of sugar? Possibly, but it's not necessarily a common sense link. Even if we thought to ourselves, "people who are overweight probably consume large amounts of sugar", this would do nothing to resolve the paradox. It would just restate it. We would be thinking, "These overweight people, who consume large amounts of sugar, have below-average blood sugar". That's just reiterating the final sentence. It's not explaining how someone who consumes lots of sugar could have below-average sugar.

  2. No Impact0% picked this

    Fruits, vegetables, meats, and dairy products often contain as much sugar

    We don't care from what source people are getting their sugar. We just care about understanding how people who are eating large amounts of sugar, which increases their level of blood sugar, nonetheless have below-average levels of blood sugar.

  3. Correct88% picked this

    Consuming large amounts of sugar causes the body to secrete abnormally high amounts of insulin,

    Why this is right

    This gives us a way to explain how someone who consumes a large amount of sugar could end up with below-average levels of unmetabolized sugar. When you consume a large amount of sugar, the body secretes an abnormally high amount of insulin, which metabolizes the sugar in your blood. Thus, you have relatively little unmetabolized sugar in your blood, because the insulin has metabolized most of it. Here's the causal chain we're describing: eat lots ? secrete lots ? sugar gets ? not much of sugar of insulin metabolized unmetab. sugar left Does this cheat the background condition of the paradox? If eating sugar causes the release of insulin, and insulin metabolizes the sugar in your blood, then why did the first sentence say that the level of unmetabolized sugar rises following consumption of sugar? 1. Our blood sugar might initially rise, because it takes some time for the insulin to be released and to travel throughout the bloodstream metabolizing the sugar. 2. This answer is saying that there's a special mechanism that kicks in when large amounts of sugar are consumed. An abnormally high amount of insulin is released. So maybe moderate amounts of sugar don't wake up the insulin dragon, and so the unmetabolized sugar can accumulate in the bloodstream. But consuming a large serving of sugar triggers the insulin dragon to wake up and break down most of the sugar in our blood. It's like the old adage "you gotta spend money to make money", but now it's "you gotta eat a bunch of sugar to metabolize a bunch of sugar".

    Skill tested: Paradox · how this choice captures the argument's function is the move to repeat next time.

  4. Deepens the Paradox9% picked this

    Consuming large amounts of sugar can lead eventually to the failure of the body to produce enough

    (D) is for diabetes, which is what this answer describes. According to this answer, people who consume large amounts of sugar can lose their ability to produce a sugar-metabolizing enzyme. In other words, they lose the ability to metabolize the sugar in their blood, so they should end up with higher than average levels of unmetabolized sugar in their blood. This is the opposite of what we want. It's giving us a way to think that people who consume large amounts of sugar would have more unmetabolized sugar in their blood than others.

  5. No Impact / No Distinction2% picked this

    Sugar passes into the bloodstream before it can

    This is clarifying that sugar doesn't get metabolized in the digestive tract, but that has nothing to do with resolving our paradox. This doesn't give us any way to explain how consuming large amounts of sugar (which increases unmetabolized sugar in the blood) is leading to having below-average levels of unmetabolized sugar in the blood.

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