Food Unwrapped

Channel 4, Friday, 8pm

Jimmy Doherty is investigating turmeric. He visits India on the trail of the exotic spice and finds himself at a wedding where guests are showered with it.

Kate Quilton wants to find out how much milk goes into a bar of chocolate and, if you have ever wondered why asparagus gives some of us a rotten-like pungent problem with our pee,andi Oliver may have the answer.