What we eat may leave a quiet, visible signature on our skin. Australian researchers studying 137 adults have found that skin yellowness — driven by carotenoid pigments absorbed from fruits and vegetables — correlates meaningfully with dietary intake, raising the possibility of a non-invasive, objective way to assess how well people are nourishing themselves. Yet the body is not a neutral canvas: ethnicity, natural skin tone, and body composition all shape the very signal researchers hope to read, reminding us that even a number produced by a machine carries the complexity of the human it meas