Depression is a whole-body illness. It involves the body, mood, and thoughts. Depression affects the way you eat and sleep. It also can affect the way you feel about yourself and things. It is not the same as being unhappy or in a “blue” mood. It is not a sign of personal weakness or a condition that can be willed or wished away. When you have depression, you can’t “pull yourself together” and get better. Treatment is often needed and many times crucial to recovery.