Sugar Intake May Worsen Gut Microbiome Disruption During Antibiotic Treatment

What's new

A recent study published in Nature indicates that a diet rich in simple sugars can worsen the disruption of the gut microbiome caused by antibiotic treatment [1]. Researchers observed this phenomenon in hospitalized patients undergoing hematopoietic cell transplantation, who frequently receive antibiotics. The findings suggest that avoiding sugary foods during antibiotic courses might help mitigate adverse changes to gut microbial communities.

The science behind it

The study tracked the dietary intake of 173 patients hospitalized for hematopoietic cell transplantation, meticulously recording 9,419 meals. Concurrently, their gut microbiome changes were analyzed through longitudinal samples from 158 patients. Using Bayesian inference, the researchers identified a correlation: patients who consumed more sweets and sugars during antibiotic exposure experienced more pronounced microbial dysbiosis. This dysbiosis manifested as a reduction in microbial diversity (lower alpha-diversity) and a greater proliferation of Enterococcus, a type of bacteria often associated with opportunistic infections.

To further investigate this link, the researchers conducted experiments in mice. These animal models confirmed the human observations, showing that supplementing the mice's diet with sucrose increased and prolonged the expansion of Enterococcus following antibiotic administration. The study highlights that while diet is known to influence the gut microbiota, its specific effects during periods of extreme perturbation, such as antibiotic treatment, have been less understood. This research provides a more precise understanding of how specific dietary components, like simple sugars, can interact with antibiotic effects on the microbiome.

What it means in practice

For individuals undergoing antibiotic treatment, particularly those in vulnerable states like hospitalized patients, these findings suggest a practical dietary consideration. Limiting the intake of simple sugars and sweets during antibiotic therapy could potentially help preserve the diversity of the gut microbiome and reduce the overgrowth of potentially harmful bacteria like Enterococcus. This dietary adjustment might contribute to a more resilient gut environment, supporting overall recovery and potentially reducing the risk of complications associated with microbiome disruption. While further research is needed to generalize these findings across broader populations, the study offers an actionable insight for healthcare providers and patients alike regarding dietary choices during antibiotic use.

Caveats

It is important to note that the human cohort in this study consisted of patients undergoing hematopoietic cell transplantation, a population with compromised immune systems and often severe medical conditions. Their specific physiological state and the intensive medical treatments they receive might influence how their microbiomes respond to diet and antibiotics, potentially limiting the direct generalizability to healthy individuals or those on antibiotics for less severe conditions. Additionally, while the study meticulously tracked diet, it focused on the correlation between sugar intake and microbiome changes, rather than establishing a direct causal mechanism in humans. The mouse models provided stronger causal evidence, but animal study results do not always translate directly to humans. Future studies involving independent and more diverse cohorts are necessary to confirm these findings and explore their applicability across different populations and clinical scenarios.

Source: [1]