medium · GMAT Verbal
A study found that people who eat breakfast daily are 30% less likely to be overweight. The researchers concluded that eating breakfast causes a person to maintain a healthier weight.
Which of the following, if true, most weakens the conclusion?
- Some people who regularly skip breakfast report feeling distinctly more alert and energetic in the morning.
- Breakfast foods are often rich in dietary fiber, a nutrient that is widely thought to aid healthy digestion.
- The study tracked its participants over a full five years and drew on a notably large sample size.
- Breakfast is widely regarded as the single most important meal of an ordinary person's day.
- Daily breakfast eaters are also far more likely to exercise regularly than those who skip breakfast.
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