According to a study completed at Wollongong Hospital in Australia, the prevalence of gestational diabetes will vary with the seasons. Higher rates are experienced during the summer, while lower rates are more common in the winter.
This study was based on about 7,400 pregnancy glucose tolerance tests that were collected over a three-year time span in a temperate climate. It was found that at the one-hour diagnostic levels, the prevalence of gestational diabetes was 29% higher in the summer and 27% lower within the winter. At the two-hour diagnostic level, the prevalence of gestational diabetes was 28% greater in the summer and 31% lower in the winter.
These findings were published in Diabetes Care on May 10, 2016.