Latest Trustworthy News from Dr. Mercola - delivered straight to your inbox!

Why Do Insides of Apples Turn Brown After Slicing?

eating red apple

Story at-a-glance

  • Cutting an apple exposes the cells to oxygen, which allows polyphenol oxidase (PPO) enzymes to rapidly oxidize the phenolic compounds in the apple tissues into ortho-quinones (o-quinones)


This is an older article that may not reflect Dr. Mercola’s current view on this topic. Use our search engine to find Dr. Mercola’s latest position on any health topic.


By continuing to browse our site you agree to our use of cookies, revised Privacy Policy and Terms of Service.