In aged rats fed an obesogenic diet, CBD at 15 mg/kg daily reduced anxiety-like behavior, lowered circulating endotoxin levels, and decreased brain inflammation markers.
Aging researchers, obesity-inflammation scientists, and preclinical CBD researchers.
CBD at 15 mg/kg daily reduced anxiety and brain inflammation in 18-month-old obese rats
What the researchers found
Cafeteria diet increased anxiety-like behaviors, circulating LPS (endotoxemia), and prefrontal cortex IL-6 in 18-month-old rats. CBD (15 mg/kg/day orally) reduced anxiety in the open field test, decreased circulating LPS, and reduced prefrontal cortex IL-6, TNF-alpha, and TLR4 expression. The obesogenic diet also disrupted endocannabinoid levels (2-AG and anandamide) and altered CB1/CB2 receptor expression in the brain.
Why it matters
Obesity and aging together create a neuroinflammatory state that drives anxiety and cognitive decline. Finding that CBD can address this intersection is relevant given the aging population and obesity epidemic.
The numbers in context
CBD dose: 15 mg/kg/day orally. Rats aged 18 months. CBD reduced circulating LPS, IL-6, TNF-alpha, and TLR4 in prefrontal cortex. Cafeteria diet reduced 2-AG and anandamide and altered CB1/CB2 expression.
How the study worked
Four groups of 18-month-old male Wistar rats: control+vehicle, control+CBD, cafeteria diet+vehicle, cafeteria diet+CBD. Diets for 8 weeks, then oral CBD (15 mg/kg/day) or vehicle concurrently for additional weeks. Behavioral tests, cytokine analysis, endocannabinoid measurements, and receptor expression assessed.
What this study cannot tell us
Male rats only. Cafeteria diet model is extreme compared to typical human diets. CBD dose relative to human equivalent dosing needs consideration. 18-month-old rats represent late middle age, not elderly. No long-term safety data.
How to read the evidence
Single animal study with comprehensive outcome measures but limited by male-only design and extreme dietary model.
When this study was published
2025 publication.
The bigger picture
The study connects several dots: obesity causes gut-derived endotoxemia, which drives brain inflammation, which disrupts the endocannabinoid system, which increases anxiety. CBD appears to intervene at multiple points in this cascade.
Questions still open
- Would CBD show the same anti-anxiety effects in aged female rats with diet-induced obesity?
- Could CBD prevent rather than treat obesity-induced neuroinflammation if started earlier?
Read the original research
Cannabidiol attenuates diet-induced metabolic endotoxemia, neuroinflammation, and anxiety-like behaviors in male aged rats.
Brain, behavior, and immunity, 130, 106121
Citation
Jantsch, Jeferson; Rodrigues, Fernanda da Silva; Wickert, Fernanda; Fraga, Gabriel de Farias; Dias, Victor Silva; Bitencourt, Yasmin Meireles; Giovenardi, Márcia; Guedes, Renata Padilha. (2025). Cannabidiol attenuates diet-induced metabolic endotoxemia, neuroinflammation, and anxiety-like behaviors in male aged rats.. Brain, behavior, and immunity, 130, 106121. https://doi.org/10.1016/j.bbi.2025.106121
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