medium · GMAT Verbal
A nutritionist notes that people in Country X, whose diet is rich in fermented foods, have a lower incidence of a certain digestive disorder than people in Country Y, whose diet contains few fermented foods. She concludes that regularly eating fermented foods protects against this digestive disorder.
Which of the following, if true, most strengthens the nutritionist's conclusion?
- In Country Y, people who later adopted fermented foods saw disorder rates approach Country X's own.
- Country X and Country Y differ substantially in average income and access to health care overall.
- Fermented foods have been part of Country X's culinary tradition for many centuries now.
- The digestive disorder in question is not life-threatening and is easily treated once it is diagnosed.
- Residents of Country X consume noticeably more calories per day, on average, than those of Country Y.
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