"We knew, like before, we had to start over," says Howard via Skyrim's official website. "We needed to reinvent large parts of the game and its tech. We started with the graphics renderer and how we would bring the scale of snow-covered mountains, dynamic weather systems and massive dragons to life, along with the small details of how people lived - from the forks they used to the fish they caught and the meat they cooked. We then rewrote all the major graphics and gameplay systems, including lighting, shadows, level of detail, animation, interface, scripting, dialogue, quest systems, melee, magic and more."
Taken from http://www.computerandvideogames.com/301087/e3-2011-games-elder-scrolls-v-skyrim/
Notice the line: "... along with the small details of how people lived - from the forks they used to the FISH THEY CAUGHT and the meat they cooked."