food level of Entity

There are procedure blocks like "max health of" and "current health of"

but I need these for food level and I cant find any ... help pls :/

for context:

I am trying to make a potion effect that keeps your hunger bar at 50% or lower.

(I tried to divide the max food level of the entity by 2 every time the hunger bar goes over 50% but ... now im writing this xD)