Food is produced inherently by all types of terrain with these exceptions:
Additional food may be generated by these tile improvements:
All food resources ( Bananas, Clams, Corn, Cows, Crabs, Deer, Fish, Pigs, Rice, Sheep, and Wheat) generate food. These resources add +1 Food to their tile even before they are improved and some more when they are improved. The luxury resources Sugar () and Whales () generate food without any improvements, as well. In addition, Spices () and Wine () generate food when improved.