Food is a item in Prodigy that was recently added which would give you health when you consume it. You can not eat food during a battle, but you can use it anywhere as long as you are not fighting (ex, it can be used in any of the areas like Skywatch) The food is only able to heal you wizard. Here is a list of the known foods, the heart healing power, and know ways of how to get them.
Apple - heals 160 hearts
Croissant - heals 160 hearts
You can obtain the item by logging in for the daily bonus on day 4/5, or winning from battles (in chest)
Salad - heals 280 hearts
Pizza - heals 480 hearts
Pizza is currently only obtainable by answering a question from Sir Vey at the southern dock in Lamplight town, which is only about once a week.
Chicken - heals 400 hearts
You can obtain a chicken by landing on the option from the Twilight Wheel.
Cake- Heals ??? Hearts
You cna obtain a cake from the Twilight Wheel