Logical ReasoningDifficulty: Medium

PT130 S4 Q10 Explanation

Nutritionists believe that

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

TopicsWeaken

Keep going in LSAT Lab

  • Save & drill this skill build targeted practice sets from questions like this one

  • Video walkthroughs watch every question solved step by step

  • 81 official LSATs as questions, timed sections & full-length tests

Full official LSAT questions are available through LawHub. This page provides LSAT Lab's explanation, strategy, and review tools without republishing the full official question.

Stimulus

Nutritionists believe that a person's daily requirement for vitamins can readily be met by eating five servings of fruits and vegetables daily. However, most people eat far less need to take vitamin pills.

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
10.

Which one of the following statements, if true, most seriously weakens

Answer choices

  1. Irrelevant Distinct5% picked this

    Even five servings of fruits and vegetables a day is insufficient unless the intake is varied to ensure

    This is trying to weaken the advice of nutritionists. We need to weaken this author's argument about vitamin pills.

  2. Irrelevant Distinct8% picked this

    Certain commonly available fruits and vegetables contain considerably more nutrients

    What does this have to do with vitamin pills, or with an alternate way for most people to get their daily vitamins?

  3. Too Weak /Irrelevant4% picked this

    Nutritionists sometimes disagree on how much of a fruit or vegetable constitutes

    "Sometimes" is almost always too weak to be correct on Strengthen/Weaken. Not to mention, what does this have to do with vitamin pills or with an alternate way to get our daily vitamins?

  4. Correct74% picked this

    Many commonly consumed foods that are neither fruits nor vegetables are fortified by manufacturers with the vitamins found

    Why this is right

    This gives us a way to argue that we don't need to take vitamin pills. After all, we could just eat meat or grains or carbs that are fortified with vitamins. The argument never said that most people weren't getting their daily vitamins. It said that most people weren't eating the five servings of fruits/veggies that would get them their vitamins. This answer suggests an alternate way to get daily vitamins (which people may already be doing): having a couple servings of fruit/veggies and a couple servings of fortified foods that also contain these vitamins.

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

  5. Out of Scope: "fiber"10% picked this

    Fruits and vegetables are also important sources of fiber, in forms not found

    This sounds like a little bit of knock against vitamin pills, but it's irrelevant. We're only concerned with getting our daily vitamins. Fiber might be a bonus, but it's out of scope to why this author thinks we need vitamin pills.

Continue the review in LSAT Lab

Save this question, watch the video walkthrough, and drill similar questions in your LSAT Lab account.

LSAT Lab

Turn this review into a targeted study plan.

Save this question, drill more like it, watch the video walkthrough, and track your progress in your LSAT Lab account.

Start practicing free