HUD bars
Wuzzy

Replaces the default health and breath symbols by horizontal colored bars with text showing the number. Extensible.

Hunger with HUD bar
Wuzzy

This mod adds a simple hunger mechanic (plus HUD bar) to the game. Eat food to avoid starvation, be sated to regenerate health.

Hunger NG
Linuxdirk

Hunger NG is a mod for Minetest adding a very customizable and easy to extend hunger system.