Have you ever eaten rotten flesh? If not, try it sometime. Usually, your hearts turn green and sometimes, with food poisoning in Minecraft, you lose hearts. The color of the text is what matters. If the text says Golden apple and isn't shiny, then it's poisonous. If the text says Golden Apple and it is shiny, then eat it. The colors might be switched though.
If mosquitos were meatier, I'd prefer to eat them. For revenge.
-BrasheIma Star Wars freak!