A new study suggests that what we eat during a course of antibiotics may play a critical role in how our gut health recovers, specifically warning that sugary foods can make things worse. While it has long been known that antibiotics disrupt the delicate balance of the intestinal microbiome, researchers found that consuming sweets during this vulnerable window exacerbates the loss of microbial diversity and encourages the growth of potentially harmful bacteria.
The research focused on patients undergoing allogeneic hematopoietic cell transplantation for blood cancers, a process involving intense chemotherapy and frequent antibiotic use. Because these patients are hospitalized for extended periods, scientists were able to track their exact daily food intake alongside regular stool samples. They discovered a clear link between the consumption of simple sugars and an increase in Enterococcus, a type of bacterium that can become problematic when other beneficial microbes are wiped out.
To confirm these findings, the team turned to a mouse model where they supplemented diets with sugar during antibiotic treatment. The results mirrored those seen in humans, showing that sugar not only triggered larger blooms of opportunistic bacteria but also caused these imbalances to last longer than they would have otherwise. This indicates that simple carbohydrates provide a fuel source that allows certain pathobionts to thrive while the rest of the microbiome is suppressed.
These findings open up practical possibilities for improving patient care during intensive medical treatments. Since avoiding sugar is a relatively simple dietary adjustment, doctors may soon consider short term sugar restriction as a way to protect the gut microbiome during antibiotic therapy. By limiting these fuels for harmful bacteria, clinicians hope to reduce complications and help patients recover their internal ecological balance more efficiently after severe medical interventions.
