Al Jazeera's Investigative Unit looked inside the world of sports doping to find a network of medical professionals willing to help athletes stay one step ahead of leagues' anti-doping tests. What should be done to stop athletes from using performance-enhancing drugs?

Food is deeply tied to our culture and our identity. Every place in the world has a dish, an ingredient or a cooking style associated with it. What we eat is an expression of who we are, where we come from and perhaps where we're going. Whether you eat to nourish yourself, as a social activity, or as a way of preserving cultural heritage, we all have stories about our cuisine. On the next Stream we speak to foodies from around the world about what they eat, and why it makes them who they are.