Logical reasoning PrepTest 146 · Section 2 · Question 15

Incorrect. The Nutritionist recommends that everyone eat a lot of fruits and veggies, but there's no indication that fad diets make the same recommendation.

Incorrect. The Nutritionist establishes that fruits and veggies do contain enough nutrients to offer this protection, but there's no indication that they're the only foods to do so. Just because the Nutritionist doesn't recommend other foods for the same purpose doesn't mean they don't exist.

Incorrect. Just because dietary needs vary widely from person to person doesn't mean that every person has different health conditions and dietary needs from every other person. Height can vary widely from person to person, but there are definitely people who are the same height.

Correct. Argument or Facts:
Argument

Valid or Flawed:
Flawed

Question Type:
Must Be True

Stimulus Summary:
Most fad diets: Limited range of nutrients/foods.
Pivot: Foods are good for different problems, so needs vary widely.
Everyone: Eat your fruits and veggies to keep the doctor away!

Answer Anticipation:
This stimulus is a bit all over the place. All the statements are about diet and nutrient needs, but it's hard to see up front how the correct answer is going to combine them. The last statement is particularly strong, but it doesn't seem to lend itself to inferences other than something that more or less just restates it. Let's head into the answer choices and stick to the ones that limit themselves to discussing the issues from the stimulus!

Answer Explanation:
This answer reflects the degree of the stimulus in one place ("Most fad diets") and then is very weak ("some people"), so this answer is easy to support. We know that most fad diets prescribe a single, narrow range of nutrients for everyone. However, we also know that nutrient needs vary widely from person to person. If that's the case, then the narrow range of nutrients for everyone in a fad diet probably won't meet those wide variations, so there will be at least some people whose needs aren't met by the fad diet. This answer can be inferred based on the first two sentences of the stimulus.

Key Takeaway:
Don't always feel the need to have a specific prediction of what the correct answer is going to sound like! The correct answer choice to a Must Be True question that doesn't have conditional logic will frequently be tough to anticipate. Make sure you have a clear understanding of the stimulus, note the logical force of the statements, and consider each answer choice in turn with those things in mind.

Incorrect. While the stimulus establishes that different foods contain different "nutrients that are helpful for treating...different health problems," there could be other nutrients that are common to all foods. The statement in the stimulus is about the mix of nutrients in a given food, so foods could have unique mixes despite sharing some of the same ingredients.