Objective:<br> To describe the determinants of 12‐year weight change among middle‐aged women in Sweden. <br>Methods:<br> In 1991/1992, 49,259 women across Sweden were recruited into a cohort. In 2003, 34,402 (73%) completed follow‐up. Lifestyle and health characteristics including weight were collected, and 12‐year weight change and substantial weight gain (≥+5.0 kg) were calculated; association ...