The Food Warehouse increases the amount of protected food in your base. Construction requires Base level 10. Its main stat is Protect Food Quantity, separate from the hourly production of a Food Factory.
How protection develops
Protected food quantity is 900 at warehouse level 1. It reaches 180,000 at level 10, 9.9 million at level 20 and 225 million at level 30.
Those values are the protected quantities at each level. Upgrading from one level to another adds the difference between them; it does not add the entire new value on top of the old one.
Other protection bonuses
Research includes improvements to protected food quantity, and alliance technology can raise the protected food limit for allies. These are separate sources of development from the warehouse building itself.
The Iron Warehouse protects iron, and the Coin Vault covers coins. Each uses its own resource-specific stat. A Food Warehouse upgrade does not produce food or raise the other warehouses' listed protection values.
