Why does ground beef release a lot of 'juice' while cooking?

Ground beef releases a lot of liquid while cooking due to its high fat content. The fat melts and the liquid is released as it cooks, which is why it's important to cook ground beef over medium to high heat. The liquid usually contains some of the proteins and fat that have been broken down during the cooking process, and it also helps to create a more flavorful dish. The liquid can be drained off, or used to make sauces or gravies. To prevent the beef from becoming dry and tough, it's best to cook it quickly at a high heat and drain off any excess liquid.