CBD Reduced Depression-Like Behavior and Brain Inflammation in Female Rats Exposed to Stress and a High-Fat Diet | Research

The takeaway

In female rats subjected to both a high-fat diet and chronic stress, CBD treatment reduced depressive behaviors and normalized brain inflammation markers, with effects varying by type of stressor.

Researchers studying CBD for depression, and those interested in sex-specific and comorbidity-focused approaches.

CBD normalized brain inflammation markers in female rats

What the researchers found

Female rats exposed to both a high-fat diet (2 weeks) and chronic unpredictable mild stress (4 weeks) received CBD (10 mg/kg) during the final 2 weeks. CBD promoted active coping behavior, increased locomotion, reduced freezing, and restored depressive-like behavior in the splash test. In the prefrontal cortex, CBD normalized stress-induced increases in IL-1 beta and downregulated NF-kB1 and TNF-alpha expression.

Why it matters

Depression and obesity frequently co-occur and share neuroinflammatory mechanisms. This study uses female rats specifically, addressing a major gap since most preclinical depression research uses males. The finding that CBD's effects depend on stressor type has implications for understanding when CBD might be most beneficial.

The numbers in context

CBD dose: 10 mg/kg for 2 weeks. HFD: 2 weeks. UCMS: 4 weeks. CBD normalized IL-1 beta and downregulated NF-kB1 and TNF-alpha in prefrontal cortex.

How the study worked

Female Wistar rats exposed to 2 weeks of high-fat diet followed by 4 weeks of unpredictable chronic mild stress. CBD (10 mg/kg, i.p.) or vehicle administered during the last 2 weeks. Behavioral testing and mRNA analysis of inflammatory markers in prefrontal cortex and hippocampal CA1.

What this study cannot tell us

Animal study in female rats only. Single CBD dose tested. Short treatment duration. Intraperitoneal injection, not oral administration. Artificial stress model may not fully capture human depression.

How to read the evidence

Preliminary: animal study with detailed mechanistic work, but single sex, dose, and route of administration.

When this study was published

Published in 2025.

The bigger picture

The finding that CBD's efficacy depends on the type of stressor suggests it may be more helpful for certain depression subtypes than others. The focus on female subjects and the obesity-depression comorbidity addresses two major gaps in current CBD research.

Questions still open

Does CBD show different effects for different types of depression in humans?
Would CBD help with depression in people who are also obese?
Do these findings apply to males as well?

Common questions

Can CBD help with depression related to obesity?

In this female rat study, CBD reduced depressive behaviors and brain inflammation markers when both high-fat diet and chronic stress were present. Human studies would be needed to confirm these findings.

Does CBD affect brain inflammation?

This study found CBD normalized several inflammatory markers (IL-1 beta, NF-kB1, TNF-alpha) in the prefrontal cortex of stressed, obese female rats, suggesting anti-inflammatory effects in the brain.

Read the original research

Cannabidiol Effects on Depressive-like Behavior and Neuroinflammation in Female Rats Exposed to High-Fat Diet and Unpredictable Chronic Mild Stress.

Cells, 14(12)

View on PubMed ↗Publisher’s paper ↗

Citation

Sabbag, Tal; Kritman, Milly; Akirav, Irit. (2025). Cannabidiol Effects on Depressive-like Behavior and Neuroinflammation in Female Rats Exposed to High-Fat Diet and Unpredictable Chronic Mild Stress.. Cells, 14(12). https://doi.org/10.3390/cells14120938