A nice visual tweak!

A simple concept executed well, it makes TFC's hotbar UI look more like vanilla by replacing the bars with hearts/icons, very useful when using any resource pack which aims to also do that but to the mod's textures; so that both the game world and UI are more consistent instead of still having the TFC UI alongside a resource pack's more vanilla styled textures.

I like the hearts as they better visually indicate how much health I have, as hearts are removed or added based on max hp. (TFC changes max hp based on nutrition.)

I do understand if some people feel that TFC's overhaul of vanilla is somewhat its (unique visual) identity, then this is not the mod for you, but personally I can cede the hotbar UI, gimme these hearts instead lol!