A food safety issue has impacted sales at a popular restaurant chain. The company's parent reported a decline in customers after making a change to its menu. This move was made in response to a growing health concern.

The health concern is linked to contaminated produce, but the exact cause is still unknown. An initial finding was later determined to be incorrect. Further information about the issue and its impact on the company is available from the source, including details on the timing and extent of the decline in sales.