More elegant way to constantly update player health algorithms.

Building a RPG game and the players health is dynamic and is calculated by combining the players base health with their stamina. The player can use a buff to increase his stamina throughout the game and therefore increasing the players total hit points and ultimately requiring the health to update.

Currently right now I am calling a function repeatedly in Update as shown;

 void Update() {
     characterHealthBar.value = characterHealth;
     characterManaBar.value = characterMana;

     // Control Max Health
     if (characterHealthBar.value >= characterMaxHealth) {
         characterHealth = characterMaxHealth;
     }
     CalculateCharacterMaxHealth (baseCharacterHealth, characterStamina);
 }

This calls the following;

 public void CalculateCharacterMaxHealth(float _baseCharacterHealth, float _CharacterStamina) {
         characterMaxHealth = _baseCharacterHealth + (_CharacterStamina * 2);
     characterHealthBar.maxValue = characterMaxHealth;
 }

Is there a better way to achieve this?