According to a group of French scientists, who've studied the diets of more than a hundred thousand people, people who eat highly-processed (or ultra-processed) food are more likely to develop cancer. Ultra-processed foods contain artificial ingredients designed to keep them fresh on shop shelves and to make them more appetising. These include ready meals, cakes, mass-produced bread and instant noodles. Al Jazeera's Neave Barker reports from London.
