Researchers at the University of California, Riverside, have taken a closer look at a pattern that has puzzled clinicians and scientists for years. Regular cannabis consumers often show lower body weight and a reduced risk of type 2 diabetes, even though THC is widely associated with increased appetite. A new preclinical study published in The Journal of Physiology offers an early look at what might be driving that contradiction.
Nicholas V. DiPatrizio, a professor of biomedical sciences at the UCR School of Medicine and director of the UCR Center for Cannabinoid Research, led the work. His team set out to test whether THC alone could explain the metabolic differences seen in population studies or whether other compounds in the plant might be involved.
“This suggests that THC alone is not responsible for the metabolic benefits associated with cannabis use,” DiPatrizio told UC Riverside News. “Other compounds in the plant appear to play a critical role.”
To explore that question, the researchers used a mouse model that reflects human dietary patterns. One group received pure delta‑9 THC. Another received a whole‑plant cannabis extract that contained the same amount of THC along with the plant’s other naturally occurring compounds.
Whole‑Plant Extract Produced Broader Metabolic Changes
Both treatments led to weight loss in obese mice, but the similarities stopped there. Animals that received THC alone continued to show impaired glucose regulation, a central feature of type 2 diabetes. Even with reduced body weight, their glucose homeostasis did not improve.
The mice treated with the whole‑plant extract showed a different pattern. They lost weight and also experienced improvements in glucose regulation, suggesting that the additional compounds in the extract played a role in restoring metabolic function.
The team’s analysis points to communication between fat tissue and the pancreas as a likely factor. In healthy systems, fat cells release signaling molecules that help regulate insulin secretion. In obesity and diabetes, that signaling becomes disrupted. According to the study, the whole‑plant extract restored this communication pathway more effectively than THC alone, allowing fat tissue to better regulate blood glucose levels.
DiPatrizio said the findings highlight the need for continued research into how cannabis affects metabolic processes.
“Clinicians, researchers, and policymakers should stay tuned and pay attention to this space,” he said. “We need evidence‑based approaches to fully understand both the risks and potential benefits of cannabis and its components.”
Researchers Caution Against Using Cannabis To Manage Diabetes
Although the results are promising, the team emphasized that the study does not support using cannabis as a tool for weight loss or diabetes management. The work is preclinical, and more research is needed before any conclusions can be applied to humans.
“We’re not suggesting people should use cannabis to manage weight or diabetes,” DiPatrizio said.
Instead, the researchers plan to identify specific non‑intoxicating compounds that may offer metabolic benefits without THC’s psychoactive effects. Future studies will isolate and test individual cannabinoids and other plant molecules to determine which ones drive the improvements seen in the whole‑plant extract.
As cannabis use becomes more common and research expands, studies like this help clarify how different components of the plant may influence metabolic health. For patients and clinicians, the findings add to a growing body of work showing that cannabis is more complex than its most familiar compound and that its effects depend on far more than THC alone
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