While millions around the world face the threat of famine or malnutrition, the production of feed for livestock and fish is tying up limited natural resources that could be used to produce food for people. New research from Aalto University, published in Nature Food, shows how adjustment to the feeding of livestock and fish could maintain production while making more food available for people. These relatively simple changes would increase the global food supply significantly, providing calories for up to 13% more people without requiring any increase in natural resource use or major dietary changes.