Food Unwrapped reveals more secrets about our food. Matt Tebbutt investigates concerns about levels of naturally-occurring arsenic in baby rice products. Jimmy Doherty examines Marks and Spencer's claim that they can trace all their beef burgers back to the cow. And Kate Quilton explores whether a parasite could be hiding in your sushi.

Why is there jelly in our pork pies and how does it get there? What in nature provides the natural bright blue dye in our sweets? And why is soft shell crab such a delicacy?