While it is true that Fairy Kingdom has no energy limits, there are some limiting factors in the game. You must have enough food and resources to complete your tasks. Contrary to popular belief as told by J.R.R. Tolkien, dwarves don't eat dwarven bread. They actually prefer fresh fruits and veggies followed by an array of sweets. So if you want to keep your mines and manufactory working, you have to provide them with these. Here is a summary of the buildings in your kingdom that provide food. Click on the pictures below to see detailed information and build requirements for each Food Resource Building.