Superfood sales are booming. From the jungles of the Amazon to the bustle of New York, Nelufar Hedayat investigates how obscure foods can gain cult status and what happens to the people that grow them. Are superfoods really all they're marketed to be?

Pork is the most eaten meat on earth, leading to very intensive pig farming. The question is whether this industrial form of livestock farming poses a danger to the environment.