How canning food prevents food poisoning

Farmer Jimmy Doherty reveals the secrets behind supermarket food. Jimmy tours the biggest Heinz baked bean factory in the world which produces 5 million cans of beans a day. He investigates how they make the cans safe to eat without using any artificial additives. He discovers they heat each can to 120 degrees Celsius for 3 minutes and he is involved in ensuring this temperature is reached by sending a spy can containing a thermometer through the factory.

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