Yep Another half-health system 

It's a small datapack that changes the player's life constantly

Every 5 deaths you have you will lose 1 health point (½ heart)

But if you eat a Recovery Heart, you will recover 1 health point up to your max health! (12 Hearts)

To change the base life use the next command, values ​​must be between 1- 24 and /reload

/scoreboard players set <target> PdV <value>