You know, in Normal minecraft when we eat a food, lets say a Steak...
A steaks refills Food bar by 4🍗🍗🍗🍗
And when the player misses like 2🍗, The players will recover the 2🍗 Missing and the 2 others will go into the Regeneration
But!!! Custom food don't give this regeneration, like in older version (1.7.10)