Trouble getting hunger/thirst to act right.

I'm having trouble with my code below. I think it has something to do with the division and size of integers. I want the rate to be 7200 but it almost puts it at a standstill where the values do not update. I can also multiply it by 1.388888888888889e-4 (I can simplify this number). Each way makes the values essentially stop updating all together. If I set the rate to 2000 the values update. Not sure what I'm doing wrong.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.UI;
5.  
6. public class playerAttributes: MonoBehaviour
7. {
8.     //Variables
9.     public float maxHealth, maxThirst, maxHunger;
10.     public float thirstRate, hungerRate;
11.     public float health, thirst, hunger;
12.     public Slider healthSlider, thirstSlider, hungerSlider;
13.     public bool dead;
14.  
15.     //Functions
16.     public void Start()
17.     {
18.         health = maxHealth;
19.         hunger = maxHunger;
20.         thirst = maxThirst;
21.     }
22.  
23.     //Check and Update players current stats
24.     public void Update()
25.     {
26.         if (!dead)
27.         {
28.             thirstIncrease();
29.             hungerIncrease();
30.             if (thirst <= 0)
31.                 damageTick();
32.             if (hunger <= 0)
33.                 damageTick();
34.         }
35.         if (health <= 0)
36.             die();
37.         hungerSlider.value = hunger;
38.         healthSlider.value = health;
39.         thirstSlider.value = thirst;
40.  
41.  
42.     }
43.  
44.     //Increase how thirsty the player is by defined thirst rate.
45.     public void thirstIncrease()
46.     {
47.             thirst -= Time.deltaTime / thirstRate;
48.     }
49.  
50.     //Increase how hungry the player is by defind hunger rate.
51.     public void hungerIncrease()
52.     {
53.             hunger -= Time.deltaTime / hungerRate;
54.     }
55.  
56.     //Player died. Print message and eventually allow respawn.
57.     public void die()
58.     {
59.         dead = true;
60.         print("You have died because of thirst, hunger or was killed by something else...");
61.     }
62.  
63.     //Damage tick for hunger or thirst.
64.     public void damageTick()
65.     {
66.         health -= Time.deltaTime / 5;
67.  
68.     }
69.  
70. }

 

Why are you dividing by the hunger/thirst rate. Shouldn't you be multiplying?