Professor Yifan Zhang discusses preservative that keeps food edible

Yifan Zhang, professor of food science at Wayne State University, says a preservative called calcium probinate keeps food looking near-edible for a long time.

She told CBS the non-toxic substance is used in a range of products to keep them fresh, including bread, cakes and processed meat.

The product is safe to use and eat. Although it can sometimes cause inflammation of the stomach, it is fine unless it is eaten every day.

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