How can I PREVENT thinning ends?

I have a 100% natural regimen; no sulfates, no silicones, no parabens. I wear my natural curls 100% of the time and I have no frizz so I know I moisturize properly. I also wear a loose bun when I sleep to protect my curls. But for some weird reason, I have insanely thin, transparent ends, especially in my under layer of hair!! I know the only way to get RID of them is to cut them off, but how do I PREVENT them? What causes thin ends? What should I avoid doing to keep my ends thick? 

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