HONG KONG – 2025/09/10 10:21:42 – while blood sugar levels are commonly associated with diabetes, emerging research highlights their critical role in pregnancy outcomes. A recent large-scale study conducted in China reveals that women with low blood sugar levels before pregnancy may be at a greater risk of experiencing complications such as preterm birth and low birth weight.

Glucose,a simple sugar,serves as the bodyS primary energy source and is crucial for maintaining overall health. Both high blood sugar (hyperglycemia), frequently enough observed in prediabetes and type 2 diabetes, and low blood sugar (hypoglycemia) are recognized as potential health hazards.

Previous research has established that elevated blood sugar levels before or during pregnancy can increase the likelihood of complications, and low blood sugar during pregnancy has also been linked to negative outcomes. Though, the potential risks associated with low blood sugar before pregnancy in women without pre-existing diabetes remained unclear.

To investigate this, Hanbin Wu, a researcher at the Chinese university of Hong Kong, in collaboration with the National Research Institute for Family Planning in Beijing, undertook a comprehensive retrospective study utilizing data from the National Free Preconception Checkup Project, a public health initiative offering free health checkups to women planning to conceive.

The researchers analyzed data from 4,866,919 women in China, aged 20 to 49, who participated in the national checkup project between 2013 and 2016. Among these participants, nearly 240,000 were identified as having hypoglycemia prior to conception.

The study’s findings indicated that women with low blood sugar before pregnancy had a higher incidence of adverse pregnancy outcomes, including preterm birth, low birth weight, and birth defects.

“Along with paying attention to women with preconception hyperglycemia, our findings call for increased concern for women with hypoglycemia in preconception glycemic screening,” the authors stated in the study, published in PLOS Medicine.

Risks Associated with Body Type

“In addition to paying attention to women with preconception hyperglycemia, our findings call for increased concern for women with hypoglycemia.”

The researchers also observed that women with hypoglycemia tended to be younger than those with normal blood sugar levels and were more likely to have body mass indexes (BMIs) classified as “underweight.”

Notably, the risks associated with pre-pregnancy hypoglycemia varied among women with different BMIs. Underweight women were more prone to miscarriage, while overweight women with hypoglycemia were less likely to have babies who were larger than average for their gestational age.

Based on these findings, the researchers suggest that incorporating hypoglycemia screening into preconception care may help mitigate risks and improve pregnancy outcomes.

“These findings also highlight the necessity of comprehensive screening and coordinated interventions for abnormal FPG (fasting plasma glucose) prior to and during pregnancy, which is crucial for advancing the intervention window and mitigating the risk of adverse pregnancy outcomes,” the authors stated.

The researchers acknowledge that further research is necessary, as their analysis was limited to Chinese women. Future studies involving diverse populations could help determine whether these findings are consistent across different ethnic and geographical groups.