Soft Drink Consumption and Depression Mediated by Gut Microbiome Alterations

Area of Science:

• Neuroscience
• Microbiology
• Public Health

Background:

• Soft drink consumption is linked to adverse health outcomes, yet its connection to major depressive disorder (MDD) and the underlying mechanisms are not fully understood.
• Gut microbiota alterations are increasingly implicated in mental health conditions, but specific links to soft drink intake and MDD require further investigation.

Purpose of the Study:

• To investigate the association between soft drink consumption and the diagnosis and severity of MDD.
• To determine if gut microbiota, specifically Eggerthella and Hungatella abundance, mediates the relationship between soft drink consumption and MDD.

Main Methods:

• A multicenter cohort study in Germany analyzed cross-sectional data from 405 patients with MDD and 527 healthy controls.
• Multivariable regression and ANOVA models were used to assess the association between soft drink consumption, MDD, and gut microbiota.
• Mediation analyses were performed to evaluate the role of Eggerthella and Hungatella abundance in the soft drink-MDD link.

Main Results:

• Soft drink consumption was significantly associated with increased odds of MDD diagnosis (OR, 1.081) and higher symptom severity (P < .001).
• These associations were more pronounced in women, who also showed increased Eggerthella abundance with higher soft drink intake.
• Mediation analysis confirmed that Eggerthella significantly mediated the relationship between soft drink consumption and both MDD diagnosis (P = .011) and severity (P = .005).

Conclusions:

• Soft drink consumption may contribute to MDD through alterations in gut microbiota, particularly involving Eggerthella.
• Public health initiatives to reduce soft drink intake could mitigate depression risk, especially in vulnerable populations.
• Interventions targeting microbiome composition show promise for managing depression.