Hunger & Thirst

Hunger
The hunger system - when enabled - will cause your hunger level to slowly / randomly decrease over time, based on the "Reduce Hunger Amount" and the "Hunger Update Schedule" you set up in the Drafting Table GUI under Server Settings; player movement and activity has no effect on the amount it's reduced. Your current hunger level will be displayed in chat every time it's reduced. However, you can also view your hunger level at any time by accessing an inventory or by using a hotkey to view the Personal Inventory GUI.

To raise your hunger level, just use any of the various food items in your inventory (such as the tomato, potato or steak). Some food items need to be cooked in order to be safe to eat, namely steak and ham. Other items (such as fish and the potato) don't need to be cooked and are safe to eat raw, but cooking them will increase the amount your hunger level is raised once consumed. If you eat raw steam or ham however, there is a risk of getting food borne illness and having your health reduced by a random amount.

Note: Food items are some of the only items that can be used in your player inventory when stacked.

Thirst
Much like the hunger system, the thirst system will cause your "thirst level" to decrease over time, based on the "Reduce Thirst Amount" and the "Thirst Update Schedule" values in the Drafting Table GUI under Server Settings. Your thirst level is displayed in chat during each update, and can also be viewed by accessing an inventory or viewing the Personal Inventory GUI. To reduce your thirst and increase your thirst level, you need to use any of the water container items (such as cup, flask, clay jug or clay bowl). You have to first fill these items by going inside a water brick and "using them", then use the items again outside the water brick to fill your thirst. Each thirst-related item has a certain amount of uses before it becomes empty and needs to be refilled; you can view the container's water level by accessing an inventory or viewing your personal inventory. In addition, when inventories are saved, the water level in water containers (when planted as bricks) are also saved.

Note: the clay jug and clay bowl need to be baked in a furnace before they can be used to carry water.