This mod was made by "setosorcerer" for another youtuber named "SkydoesMinecraft". The Butter mod changes any that people would call gold into butter. You can eat gold nuggets, gold ingots, and any piece of the golden armor. When you type gold into a sign or even just type it, then it will become butter. The gold nuggets will heal half of your health meter, but it was the saturation of a watermelon, making you hungry very fast. If you eat a stick of butter then it will heal 2.5 hunger with the saturation in between beef and a golden apple. If you want to learn more about the butter mod, then you will have to look at the link above. Sadly the mod is only for 1.4.4 (sorry for 1.5 and up users).