Supermarket workers are speaking out to CBC's Marketplace about how stores tamper with best-before dates and how it can make food unsafe.

For five years, Mohammad Saffari has worked as a bakery clerk at a Loblaws store in Montreal. He says he was told to change best-before dates on fresh or frozen bakery items such as cheesecakes, muffins and pastries that were weeks or months past the best-before date.

Saffari says he was told to take cheesecakes that had passed their best-before dates and add toppings, so they would appear fresh.

He says cakes were then given a new best-before date and put back on the shelves for sale.

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