What Causes White Vaginal Discharge On Changing Diet?

So, I have been eating especially healthy lately, trying to lose some weight, and i noticed that when I started to change my diet to stricktly veggies, lean meats and berries, i have been getting a white discharge all the time. It wont go away and Its not because of my period. Why is this happening?

I am 13 years old, 5'6 and 165... but i work out over 15 hours a week.