medium · LSAT Logical Reasoning
A study found that individuals who consume at least two servings of blueberries a week perform better on memory tests than those who do not. A nutritionist concludes that adding blueberries to one's diet will improve memory.
Which one of the following, if true, most weakens the nutritionist's conclusion?
- Some people who never once eat any blueberries at all nevertheless go on to score very well on the memory tests.
- Blueberries are rich in certain antioxidants already shown to support overall brain health in laboratory rats.
- People who regularly eat blueberries are also far more likely to do daily mental exercises known to sharpen memory.
- The memory tests used throughout the study gauged only short-term recall rather than durable long-term memory.
- Blueberries are the single only food whose dietary consumption has ever been formally linked to memory performance.
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