On a bright, cold day in late November 2013, I found myself in the dark, eerie, indoor expanses of Frankfurt’s Blade Runner-like Festhalle Messe. I was there undercover, to attend an annual trade show called Food Ingredients. This three-day exhibition hosts the world’s most important gathering of ingredients suppliers, distributors and buyers. In 2011, when it was held in Paris, more than 23,000 visitors attended from 154 countries, collectively representing a buying power of €4bn (£2.97bn). Think of it as the food manufacturers’ equivalent of an arms fair. It is not open to the public. Anyone who tries to register has to show that they work in food manufacturing; I used a fake ID.