05. Is Soft Drink Consumption Linked to Major Depressive Disorder?

Text version

JAMA Study Links Soft Drinks Consumption to MDD

Today, I’ll briefly summarize a recent JAMA Psychiatry multicenter cohort study from Germany looking at the relationship between soft drink intake, major depressive disorder, and the gut microbiome.

The headline is that higher soft drink consumption was associated with having major depressive disorder and with greater symptom severity. In women specifically, part of this association appeared to run through gut microbiome changes—particularly increased Eggerthella abundance.

We already know soft drinks are linked to a range of adverse physical outcomes. Several studies have connected them to depressive symptoms, but most of the literature relies on self-report symptom scales, not clinically diagnosed major depressive disorder. The mechanisms are largely speculative.

Addressing Gaps in Prior Research

This group wanted to address both gaps. First, they focused on DSM-diagnosed major depression. Second, they examined the gut microbiome, which has been increasingly implicated in major depressive disorder.