medium · LSAT Logical Reasoning
In a study of 1,000 office workers, those who reported drinking at least four cups of coffee a day had a 25 percent lower risk of developing Type 2 diabetes than those who drank none. Therefore, drinking coffee prevents diabetes.
Which one of the following, if true, most seriously challenges the conclusion?
- Heavy coffee drinkers in the study were also far more likely to exercise regularly, and regular exercise is itself known to lower diabetes risk.
- A smaller, lower-powered study of just 100 office workers detected no statistically significant relationship between coffee intake and diabetes.
- Some of the workers who reported drinking four full cups of coffee a day nonetheless still went on to develop Type 2 diabetes during the study.
- The caffeine in coffee is known to produce an elevated resting heart rate, jitteriness, and chronic insomnia in certain sensitive individuals.
- Regular coffee consumption has also been separately linked to a reduced risk of several other serious conditions besides Type 2 diabetes alone.
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More LSAT Logical Reasoning practice
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