There are a few reasons why meat is often served with Alfredo sauce, and the first is that it tastes delicious. The second is that, since Alfredo sauce is often served with pasta, meat both helps to balance out the meal nutritionally and provides a textural contrast to the creaminess of the pasta and sauce. Meat, especially when it's been cooked or prepared in a way that allows it to retain its own juices, also provides a flavor contrast to the rich, creamy sauce that complements rather than competes with it.