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Supermarket Secrets is going behind the scenes again to reveal how the supermarkets are using the latest technology and science to bring us our food

This time, it鈥檚 the fight for our loyalty. The supermarkets know we don鈥檛 show much allegiance to them any more, so they鈥檙e all batting to find ways to keep us coming back. Gregg visits a farm which claims to be using tech to produce cheaper, healthier chickens, and he meets Asda鈥檚 head of fruit and veg to find out why it鈥檚 a challenge to remove plastic packaging. Meanwhile, Nikki sees how they are using a virtual supermarket to see what appeals to us most.