Why do farmers feed their cows sweets? What are the implications for the animals’ health, the environment and the taste of our meat? From the mystery of a rural US highway covered in Skittles, to chocolate-flavoured steak selling for hundreds of dollars, we explore the impact of feeding cows the byproducts of human food production. Plus, we take our own bag of treats onto the farm and discover cows have rather expensive tastes. Presenter: Emily Thomas (Picture: A cow eating a chocolate bar.)