Show changes in healthbar

I've been able to instantiate my health bar, stamina bar and energy bar . I have a variable to handle the pixelInset.width of the prefab. How then, do I display the changes as the player takes damage and heals?

 LifeWidth=_playerLife.GetComponent<GUITexture>().pixelInset.width;
 //this debugs out fine.
 // change is either a negative number for damage or a positive number for healing.
 //first function takes in damage or healing for the int for player life, then calls the next function which is supposed to change the bar width.
 public int OnChangeLife(int Change)
     {
             Debug.Log("Incoming Life"+CurrentPlayerLife);
             CurrentPlayerLife=CurrentPlayerLife+Change;
             Debug.Log("adjusted Life"+CurrentPlayerLife);
             return CurrentPlayerLife;
             OnChangeLifeWidth(CurrentPlayerLife, LifeWidth);
     }
 //This is supposed to calculate the new bar width, but it's not displaying. The calculation is made, but the bar doesn't change width. What am I missing? a Rect?

public void OnChangeLifeWidth( int CurrentPlayerLife, float LifeWidth) {
Debug.Log("Change the Width"); LifeWidth=(CurrentPlayerLife/MaxPlayerLife)*LifeWidth; Debug.Log("Length of bar" + LifeWidth);

Thanks!