creating a datapack to add tolerance increase to rotten flesh

the title pretty much says it all, i'd love to make a datapack that decreases the hunger effects of rotten flesh based on how much you have eaten (say 0-50 rotten flesh eaten, nothing changes, then 51-100, the hunger duration is cut in half, then 101-200, the effect amplifier is reduced and so on). I have lots of experience with python despite never having coded a minecraft datapack, don't know if its applicable at all here but i suppose any help would do. Thanks!!