Logical ReasoningDifficulty: Medium

PT4 S4 Q6 Explanation

Lourdes: Dietary fiber is an

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

TopicsWeaken

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Stimulus

Lourdes: Dietary fiber is an important part of a healthful diet. Experts recommend that adults consume 20 to fiber a day.

Kyra: But a daily intake of fiber that is significantly above that recommended level interferes with mineral absorption, especially the absorption of calcium. The public back on fiber intake.

What this question is testing

Weaken

Your task

Find the choice that makes the argument's conclusion less likely to be true.

Common trap

Answers that look negative but attack a claim the argument never relied on.

Winning move

Find the assumption the argument depends on, then pick the choice that undermines it.

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

The question
6.

Which one of the following, if true, most undermines

Answer choices

  1. Correct77% picked this

    Among adults, the average consumption of dietary fiber is at present approximately 10

    Why this is right

    If our current intake is approximately 10 grams per day, we're nowhere near the intake level that could interfere with mineral absorption.

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

  2. Too Specific: processed food15% picked this

    The more a food is processed, the more the fiber is broken down and the

    The fiber content of specific types of food doesn't impact the conclusion that we should recommend lowering fiber intake.

  3. Too Weak: many1% picked this

    Many foodstuffs that are excellent sources of fiber are economical and

    This answer is wrong for a variety of reasons and that first word should put us on notice. We need correct answers to Weaken questions to be strong enough to have an impact, and "many" is a very weak quantifier. If we read on, the idea that lots of fiber sources are cheap and easy to source is out of scope, meaning this answer has no impact on our conclusion.

  4. Opposite (if Anything)5% picked this

    Adequate calcium intake helps prevent the decrease in bone mass known

    Kyra's argument hinges on the idea that too much fiber prevents calcium absorption. Establishing calcium intake as important for our bone health supports her argument, if anything, because it gives us a good reason not to risk messing up our absorption with too much fiber.

  5. Too Weak: many1% picked this

    Many foodstuffs that are excellent sources of fiber are popular

    Like answer choice C, this one puts us on notice right out of the gate with that weak quantifier "many." Reading on, popularity is out of scope, so this answer has no impact.

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