A recent study found that individuals who regularly consume fermented foods have a significantly lower incidence of certain chronic inflammatory diseases. Researchers concluded that incorporating fermented foods into one's diet can directly improve long-term health outcomes. Which of the following is an assumption on which the researchers' conclusion depends?
✓ Correct Answer: Option A
The conclusion assumes a direct causal link. If other factors linked to the subjects' diet or lifestyle could explain the health outcomes, the conclusion that fermented foods directly improve health would be undermined.