In the years between the two world wars of the twentieth century leaders in Western countries worried about a food surplus. The hardships of the Great Depression were intensified by a glut of wheat and consequent low prices on the world market. Yet at the same time nutrition scientists protested that significant proportions of populations, even in affluent countries, were unable to afford a diet ‘adequate for health’. Fresh fruits, vegetables, dairy products and meat were out of reach for the poor.