The fat didn't leave his body. Your friend less consumption of fat forced your body to use the energy from the already consumed fat in your body, which in turns lowers the amount of fat visible to the eye. There's still fat in your friends body just not as much. A little fat is healthy for your body. <span />
The immune system<span> is a network of cells, tissues, and organs that work together to defend the body against attacks by foreign invade. These are primarily microbes—tiny organisms such as bacteria, parasites, and fungi that can cause infections.</span>
