Shift work, job strain and changes in the body mass index among women: a prospective study

Data from 52,622 women indicates that both job strain and rotating shift work are independently associated with changes in body mass index (BMI).

• Job strain and rotating shift work contribute independently to weight gain over a 4-year period.
• Concurrent exposure to rotating night shift work is linked to an inverted U-shape association with BMI change, showing a range from 0.01 to 0.14 kg increase.
• Previous exposure to rotating night shift work is associated with a dose-response relationship for BMI change, ranging from -0.02 to 0.09 kg.
• There is no evidence of job strain modifying the effects of shift work on weight gain.

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