As I mentioned, use a 2D UI not a 3D UI. HUDText or no HUDText, it's the same requirement. Your UI must be 2D.
If you insist on making it 3D, then don't even bother with the UI. Make your healthbars a part of your 3D model, on the same layer, drawn by your game camera. All you need is a UIPanel on a game object, and you can add widgets below it.