It can be discouraging to work so hard to reach your goal weight only to look in the mirror and see saggy, excess skin. Sometimes skin can’t shrink to match your body’s new, smaller size following a dramatic weight loss. This is due to poor tissue elasticity. Your skin’s elasticity depends greatly on your body’s natural collagen production. Loose following a significant weight loss can be attributed to many factors, but a reduction in collagen and elastin production are key contributors.