What can indicate that food has been thawed and refrozen?

Water crystals on frozen foods are a clear indication that food has been thawed and refrozen. When food freezes, moisture within the food forms ice crystals. If the food thaws, some of that moisture is lost due to melting. If the food is then refrozen, the moisture can re-form into ice crystals on the surface or within the product, signaling that it has gone through a thawing process before being frozen again. This not only affects the quality and texture of the food but can also pose food safety risks due to potential bacterial growth during the thawing process.

Other options do not provide evidence of thawing and refreezing. Pest signs indicate contamination or spoilage unrelated to thawing cycles. Intact vacuum-sealed packages suggest proper storage and handling, and clear plastic wrapping alone does not provide evidence of thawing or temperature fluctuations affecting the food.