Description
REQUIRES PEHKUI
In this mod, your hunger equals your size.
Scale types:
= Scale 1
= Scale 0.95
= Scale 0.9
= Scale 0.85
= Scale 0.8
= Scale 0.75
= Scale 0.7
= Scale 0.65
= Scale 0.6
= Scale 0.55
= Scale 0.5
= Scale 0.45
= Scale 0.4
= Scale 0.35
= Scale 0.3
= Scale 0.25
= Scale 0.2
= Scale 0.15
= Scale 0.1
= Scale 0.05
and no hunger = Scale 0.001953125
But thats just normal mode. It gets WAY harder with nightmare mode.
For nightmare mode each 
less hunger you have, your scale gets divided by 2, and it adds up very quickly!
The minimum size you can get is 0.00000190734863282 (default scale in minecraft is 1). So yeah... I recommend using normal mode instead of nightmare mode.
And yeah, thats basically it.
Btw I used this Mcreator plugin: Pehkui for MCreator | MCreator
Hope you have fun!