The Junk Food Challenge

Britain consumes truckloads of junk food every year. Self-confessed junk food lover Gregg Wallace asks what's in it and why we love it so much. He meets overweight kids learning to eat more healthily, and experts who explain what lurks in our burger bags and pizza boxes. Gregg finds out how a crash diet of junk food affects the health of a fitness instructor and learns how junk food can still be enjoyed as part of a healthy balanced diet.