Skin is your body's largest organ. It serves as a protective barrier between your insides and the rest of the world, helps regulate body temperature and acts as a filter. Skin exists in a constant state of growth, with old cells dying as new cells are forming. It's affected by every aspect of your life, from what you eat to where you live. Healthy skin is better able to fight signs of aging, heals much faster and staves off potential disease better than unhealthy skin.