I would like to suggest adding a gamerule (or something of that nature) to disable all hunger mechanics. This means the hunger bar never depletes, and natural health regeneration is treated as if the player is at 19/20 hunger - the slower regen, not that super-fast regen that comes from having your hunger and saturation at 100%.
This would be useful for PVP maps so players wouldn't have to keep up with food, and also because the super-fast regen can make pvp a bit awkward (if you're going to allow regeneration like that, give the players potions or golden apples). For the same reasons, it may help with adventure maps as well, especially if the use of hostile mobs in the map prevents you from using Peaceful mode.
Which brings me to my next point: yes, I'm fully aware that peaceful mode is a thing, but it has the player constantly regenerating at an extremely fast pace, and it has the side effect of preventing hostile mobs from even existing in the world. I would certainly make use of a gamerule like this (as opposed to peaceful mode) for the maps that I build.