levels, glucose (blood sugar) and insulin (a hormone that helps moderate glucose levels). It makes sense for researchers to study these variables together, because high cholesterol is associated with an increased risk of diabetes, which occurs when the body produces no insulin or insufficient insulin.
However, before digging into the study, it’s important to know that cholesterol can be described as “good” or “bad.” “Bad cholesterol” refers to LDL (low-density lipoprotein), while “good cholesterol” indicates HDL (high-density lipoprotein), which helps remove LDL deposits.
LDL (bad) cholesterol can accumulate inside your blood vessels, causing your arteries to become harder and narrower. Eventually, an artery can become so clogged that it gets completely blocked. When this happens, blood can no longer reach the tissue or organs on the other side of the obstruction, leading to a stroke or heart attack (myocardial infarction).
This can occur whether you have diabetes or not, but diabetes patients are at an elevated risk for a number of reasons, including that diabetes has a tendency to decrease HDL levels while simultaneously raising LDL levels. The more LDL builds up in your arteries, the more likely you are to develop a blockage.
In the Diabetes Care study, researchers examined 30 “chronic Cannabis smokers” whose median self-reported use was six joints per day over a period of nine and a half years. (Participants’ use ranged anywhere from three to 30 joints per day, over a period of two to 38 years.) Slightly more than half of the participants – 18 out of 30 – were male.
According to the study, “Cannabis smokers had lower plasma HDL cholesterol,” but unchanged levels of LDL. That means heavy daily Cannabis users had a decrease in good cholesterol, but no increase or decrease in bad cholesterol. However, a study published the year before in BMJ Open found a different result: that “marijuana users had a higher prevalence of serum HDL cholesterol [and] total cholesterol” – in other words, an elevated level of good cholesterol.
over a period of two to 38 years.) Slightly more than half of the participants – 18 out of 30 – were male.
According to the study, “Cannabis smokers had lower plasma HDL cholesterol,” but unchanged levels of LDL. That means heavy daily Cannabis users had a decrease in good cholesterol, but no increase or decrease in bad cholesterol. However, a study published the year before in BMJ Open found a different result: that “marijuana users had a higher prevalence of serum HDL cholesterol [and] total cholesterol” – in other words, an elevated level of good cholesterol.
The difference in findings is due partially to the fact that each study evaluated different bodily substances. The Diabetes study, which said that Cannabis lowered good cholesterol while having no effect on bad cholesterol, examined participants’ blood plasma: yellow fluid that doesn’t contain any cells. The BMJ study, which came to the opposite conclusion, looked at participants’ blood serum: the part of your blood that remains after clotting occurs.
Additionally, the Cannabis use described in the Diabetes study was far heavier than the use described the BMJ study, which classified “heavy” use as more than five uses per month (as opposed to six joints per day).
Another study, published in 2007 in Dialogues in Clinical Neuroscience, also examined marijuana’s effects on LDL and HDL. The Neuroscience study, while critical of Cannabis as a potential (though rare) trigger for schizophrenia or psychosis, also noted an increase in good cholesterol in patients who used a drug called Rimonabant.
Rimonabant actually blocks some of the effects of THC, but, like Cannabis, acts on the brain’s CB1 receptors. Intended as an anti-obesity drug, Rimonabant was never approved for use in the United States because subjects reported feelings of depression and suicidal ideation. However, the fact that Rimonabant is a CB1 antagonist, like Cannabidiol (CBD), further suggests that medical marijuana could potentially have applications in helping to improve your cholesterol.
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