THC changes how fat cells handle fatty acids, potentially affecting liver fat accumulation | Research

The takeaway

In cell studies, THC enhanced fat cell development and altered how adipocytes managed fatty acids over time, which in turn affected how much fat liver cells accumulated.

Researchers studying cannabinoid effects on metabolism, and scientists investigating the relationship between cannabis use and metabolic disease.

THC produced a biphasic response: increased fat release early, improved storage later

What the researchers found

THC produced a biphasic response in mature fat cells: initially increasing free fatty acid release, then improving fat storage by day 18 with smaller lipid droplets and enhanced lipid handling. Liver cell fat accumulation corresponded with the residual fatty acids in the fat cell environment.

Why it matters

The relationship between cannabis use and metabolic health is poorly understood. This study provides a cellular mechanism by which THC could influence fat distribution and liver fat, a key factor in metabolic disease.

The numbers in context

THC concentration: 1 uM. Fat cells monitored from day 10 to day 18. By day 18, THC-treated cells showed enhanced lipid storage, smaller lipid droplets, and elevated stimulated lipolysis.

How the study worked

In vitro study using 3T3-L1 preadipocytes differentiated in fatty acid-rich medium with THC (1 uM) or controls, with conditioned media applied to AML12 hepatocytes to assess downstream lipid uptake.

What this study cannot tell us

Cell culture study only, not tested in living animals or humans. Single THC concentration tested. The obesogenic conditions used may not reflect typical physiological fatty acid levels.

How to read the evidence

In vitro cell study provides mechanistic insight but findings have not been confirmed in animal models or human tissue.

When this study was published

Published in 2025.

The bigger picture

Epidemiological studies have paradoxically linked cannabis use with lower obesity rates. Cell-level studies like this one help explain how cannabinoids might reshape fat metabolism in ways not captured by body weight alone.

Questions still open

Does this biphasic fat cell response occur in vivo? Could THC's effects on fat-liver crosstalk contribute to the cannabis-obesity paradox seen in population studies?

Common questions

Does THC affect fat metabolism?

In this cell study, THC changed how fat cells developed and managed fatty acids, initially increasing fatty acid release but later improving storage. This affected how much fat nearby liver cells absorbed.

Could this explain why cannabis users tend to have lower obesity rates?

Possibly. The finding that THC reshapes fat cell behavior over time could contribute to the paradoxical association between cannabis use and lower obesity seen in population studies, but this needs to be tested in living organisms.

Read the original research

Distinct Adipocyte Responses to Δ9-Tetrahydrocannabinol (THC) Exposure Govern Hepatic Lipid Accumulation in an Obesogenic Setting.

International journal of molecular sciences, 26(18)

View on PubMed ↗Publisher’s paper ↗

Citation

Eitan, Adi; Gover, Ofer; Schwartz, Betty. (2025). Distinct Adipocyte Responses to Δ9-Tetrahydrocannabinol (THC) Exposure Govern Hepatic Lipid Accumulation in an Obesogenic Setting.. International journal of molecular sciences, 26(18). https://doi.org/10.3390/ijms26188860