LSAT 127 | Section 1 | Logical Reasoning: Q18

LR Question 18 Explanation

QUESTION TEXT: Nutritionist: Because humans have evolved very little since…

QUESTION TYPE: Role in Argument

ANALYSIS: The argument has the following structure: Humans are still adapted to a diet of wild foods (intermediate conclusion), because we have evolved little since agriculture (premise supporting intermediate conclusion). Straying from diet results in problems (premise supporting both conclusions); therefore the more our diet consists of wild foods, the healthier we will be (main conclusion).

This argument is the paleo diet in a nutshell.

___________

1. The premise that we have evolved little also supports this intermediate conclusion.
2. No. It is an intermediate conclusion supported by other premises.
3. It explains the main conclusion.
4. CORRECT. Yes. It supports the main conclusion by offering a reason why we are healthier on a wild food diet. It is in turn explained by the info that we have evolved little since agriculture.
5. This gets it backwards. We are biologically adapted to a wild diet because we have evolved little.

Recap: The question begins with “Nutritionist: Because humans have evolved very little since”. It is a Role in Argument question. Learn more about LSAT Role questions in our guide to LSAT Logical Reasoning question types.