So yesterday I was thinking, and the idea of a kosher mod came to mind. What if there existed a Forge mod (for 1.12.x+) that basically strikes the player with lightning any time they eat "non-kosher" foods and maybe a short positive potion effect when they eat certain kosher foods?
That would be the simplest version, could also add maybe a book that can be found as loot (or through a villager trade) that could be used to "go kosher" which could affect that single player and not others, or maybe have a block that can be placed that would make an area be under the effect of the mod (maybe 32x32/64x64 area? Or the area size depending on how the block is crafted?) so that players within that area will get hit by lightning if they eat the "wrong foods".
If I could, I would make this mod as it seems like an interesting addition to gameplay, but it would probably take me a year to learn how to make mods then actually make it.