HAIR DAMAGE 101:
-Use a heat protectant cream: This is a must. If you insist on pressing/flat ironing those curlies straight, you have to protect them. Use a serum like Mizani's ThermaSmooththat smoothes and protects the cuticle layer in your hair, which helps prevent thermal damage. One of the active ingredients in this heat protectant serum is Coconut oil (which I LOVE), which serves to "infuse moisture into each strand and help guard against breakage from mechanical damage resulting from hair straightening" so look out for that ingredient in your bottles!
I haven't found a highly natural alternative to these creams yet, but I'm working on one so stay tuned.