The first time I ran the mod, the hunger bar changed from the normal texture to white lines that almost look like hash tags. I reinstalled the mod, and now the hunger bar doesn't appear at all.

Here is a screenshot of what I see:
https://i.imgur.com/XYCWjbj.png

This is the only mod I have.

Forge 31.1.0
Minecraft 1.15.2 Java
Windows 10 OS

Got the hunger bar working again by also installing the AppleSkin mod, hope this helps.