A new study from Hokkaido University suggests that higher levels of selenium in pregnant women may reduce the risk of streptococcal infections in their children.
The research, published in PLOS ONE, found that children whose mothers had higher selenium levels during pregnancy were less likely to develop infections caused by Group A Streptococcus. These infections include common illnesses such as strep throat and skin infections, and can sometimes lead to more serious conditions like scarlet fever.
The study involved more than 74,000 mothers and their children across Japan. Researchers measured the levels of selenium and other metals in the mothers’ blood during pregnancy. These included mercury, cadmium, lead, and manganese. The children were then monitored to see if they developed streptococcal infections between the ages of three and four.
Dr. Hiroyoshi Iwata, the study’s lead author from the Center for Environmental and Health Sciences at Hokkaido University, said the link between higher selenium levels and lower infection rates was strongest in mothers with the highest selenium concentrations. However, he also warned against overconsumption. “High selenium levels can be toxic, so caution is necessary,” Iwata said. “Our findings are based on a single blood sample, and they should not be used alone to recommend selenium intake during pregnancy.”
Selenium is a trace element known for supporting immune function. Previous studies have shown that it helps the body fight infections by boosting immunity. This new research adds to growing evidence that selenium may play a key role in protecting children’s health.
While the study focused only on streptococcal infections, researchers believe the findings underline the importance of proper nutrition during pregnancy. More research is needed to confirm how selenium works with the immune system and to find the safest and most effective intake levels for expectant mothers.
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