
Summer pregnancy may raise gestational diabetes risk
Researchers have identified a new possible risk factor for gestational diabetes: Being exposed to hot outdoor temperatures in the month before giving birth.
According to a new study published in the Canadian Medical Association Journal (CMAJ), in one geographic region in Canada, the rate of gestational diabetes varied more than 3 percentage points between the coldest times of year and the hottest.
Gestational diabetes, a condition that develops during pregnancy, is usually a temporary condition. But women who develop it are at higher risk for type 2 diabetes and other health conditions later on. (One recent study linked gestational diabetes to postpartum depression, for example.)
Gestational diabetes can also raise babies' risks of excessive birth weight, preterm birth, and type 2 diabetes later in life.
Previous studies have suggested that exposure to cold temperatures can improve insulin sensitivity and activate the body's brown fat tissue, which -- unlike other types of fat -- burns calories and seem to protect against metabolic conditions like obesity and diabetes.
For this reason, it's been suggested that cold temperatures might protect against these conditions.
To study this potential connection in pregnant women, researchers looked at medical records of nearly 400,000 women living in the same urban area in Canada, in a region with wide temperature fluctuations throughout the year. Over a 12-year period, those women gave birth to more than 555,000 children.
When the researchers looked at average temperatures in the 30 days before these women gave birth, they found tha
Continue
reading