Losing weight can be a significant achievement, often improving overall health, mobility and confidence. However, some people notice an unexpected change after substantial weight loss: their face appears thinner, less youthful or more tired than before. Cheeks may look hollow, the skin around the jawline may appear loose, and fine lines can become more noticeable. These changes are sometimes informally described as weight-loss face or Ozempic face, although they are not medical diagnoses. Why does this happen? The answer lies in the relationship between facial fat, skin elasticity, collagen, ageing and the speed and extent of weight loss. Understanding these