A review of 12 studies involving more than 225,000 people, of whom almost 15,000 had diabetes, has found that shift work carries a 9% higher risk of type 2 diabetes, especially in men and those with rotating shift patterns. Men, in fact, had a 37% greater risk of developing diabetes if they did shift work, while those who did rotating shifts had a 42% higher risk than those who worked a fixed shift pattern.
Gan, Y., Yang, C., Tong, X., Sun, H., Cong, Y., Yin, X., … Lu, Z. (2015). Shift work and diabetes mellitus: a meta-analysis of observational studies. Occupational and Environmental Medicine, 72(1), 72–78. http://doi.org/10.1136/oemed-2014-102150