Armor to Health is an Experimental mod that changes armor's dynamic a little; Instead of giving resistance to attacks, it grants more maximum health.
This mod doesn't edit the protection enchantments.
Configurable
Some Config Options are avalible for tweaking the mod's behavior to your liking.
There is also functionality for natural health regen for both mobs and players, as well as a tag to blacklist certain mobs from naturally healing. This is disabled by default.
Dynamics
Outhealing things becomes harder, but the extra health also makes you less vunerable to things like poison, suffacation and fall damage.
Recommendations
This is best used alongside other mods that make food and healing less annoying. Beta Style minecraft eating and the "Hearty Meals" mod go good with this.