This is an excerpt from CBD: A Patient’s Guide to Medicinal Cannabis by Leonard Leinow & Juliana Birnbaum.
Cannabinoid therapy is connected to the part of the biological matrix where body and brain meet. Since CBD and other compounds in cannabis are so similar to the chemicals created by our own bodies, they are integrated better than many synthetic drugs. According to Bradley E. Alger, a leading scientist in the study of endocannabinoids with a PhD from Harvard in experimental psychology, “With complex actions in our immune system, nervous system, and virtually all of the body’s organs, the endocannabinoids are literally a bridge between body and mind. By understanding this system, we begin to see a mechanism that could connect brain activity and states of physical health and disease.”
Reduced Risk of Diabetes & Obesity
Several studies have shown that regular cannabis users have a lower body mass index, smaller waist circumferences, and reduced risk of diabetes and obesity. One 2011 report published in the American Journal of Epidemiology, based on a survey of more than fifty-two thousand participants, concluded that rates of obesity are about one-third lower among cannabis users. This is despite the findings that participants tend to consume more calories per day, an activity that is potentially related to THC’s stimulation of ghrelin, a hormone that increases appetite but also increases the metabolism of carbohydrates. CBD on its own was shown in 2006 to lower the incidence of diabetes in lab rats, and in 2015 an Israeli-American biopharmaceutical collective began stage 2 trials related to using CBD to treat diabetes. Research has demonstrated that CBD helps the body convert white fat into weight-reducing brown fat, promoting normal insulin production and sugar metabolism.
In studying over 4,600 test subjects, researchers found that current cannabis users had fasting insulin levels that were up to 16 percent lower than their non-using counterparts, higher levels of HDL cholesterol that protects against diabetes, and 17 percent lower levels of insulin resistance. Respondents who had used cannabis in their lifetime but were not current users showed similar but less pronounced associations, indicating that the protective effect of cannabis fades with time.
Excess insulin promotes the conversion of sugars into stored fat and leads to weight gain and obesity. The research emerging about the interplay between cannabinoids and insulin regulation may lead to some major breakthroughs in the prevention of obesity and type 2 diabetes.
Better Cholesterol Profiles & Lowered Risk of Cardiovascular Disease
A 2013 study that measured data from 4,652 participants on the effect of cannabis on metabolic systems compared non-users to current and former users. It found that current users had higher blood levels of high-density lipoprotein (HDL-C) or “good cholesterol.” The same year, an analysis of over seven hundred members of Canada’s Inuit community found that, on average, regular cannabis users had increased levels of HDL-C and slightly lower levels of LDL-C (“bad cholesterol”).
Linked to diet and lifestyle, atherosclerosis is common in developed Western nations and can lead to heart disease or stroke. It is a chronic inflammatory disorder involving the progressive depositing of atherosclerotic plaques (immune cells carrying oxidized LDL or low-density lipoproteins). A growing body of evidence suggests that endocannabinoid signaling plays a critical role in the pathology of atherogenesis. The condition is now understood to be a physical response to injuries in the arterial walls’ lining, caused by high blood pressure, infectious microbes, or excessive presence of an amino acid called homocysteine. Studies have demonstrated that inflammatory molecules stimulate the cycle leading to atherosclerotic lesions. Existing treatments are moderately effective though carry numerous side effects. CB2 receptors triple in response to inflammation, allowing anandamide and 2-AG, the body’s natural cannabinoids, to decrease inflammatory responses. The CB2 receptor is also stimulated by plant-based cannabinoids.
A 2005 animal trial showed that low-dose oral cannabinoids slowed the progression of atherosclerosis. Researchers the following year wrote that the immunomodulatory capacity of cannabinoids was “well established” in science and suggested they had a broad therapeutic potential for a variety of conditions, including atherosclerosis.
A 2007 animal study with CBD showed it had a cardioprotective effect during heart attacks, and more details were published that year about the involvement of the CB1 and CB2 receptors in cardiovascular illness and health.
Reduced Risk of Cancer
Could cannabidiol help prevent tumors and other cancers before they grow? A 2012 study showed that animals treated with CBD were significantly less likely to develop colon cancer after being induced with carcinogens in a laboratory. Several studies had already shown that THC prevents tumors and reduces them, including one in 1996 on animal models that found that it decreased the incidence of both benign and hepatic adenoma tumors. In 2015, scientists analyzed the medical records of over eighty-four thousand male patients in California and found that those who used cannabis, but not tobacco, had a rate of bladder cancer that was 45 percent below the norm. Topical products can be used to treat and prevent skin cancers. Continuing research is focused on the best ratio of CBD to THC and the most effective dose level in cancer prevention and treatment.
Cannabinoids Help Maintain Brain Health & Create Resilience to Trauma & Degeneration
Cannabinoids are neuroprotective, meaning that they help maintain and regulate brain health. The effects appear to be related to several actions they have on the brain, including the removal of damaged cells and the improved efficiency of mitochondria. CBD and other antioxidant compounds in cannabis also work to reduce glutamate toxicity. Extra glutamate, which stimulates nerve cells in the brain to fire, causes cells to become over-stimulated, ultimately leading to cell damage or death. Thus, cannabinoids help protect brain cells from damage, keeping the organ healthy and functioning properly. CBD has also been shown to have an anti-inflammatory effect on the brain.
As the brain ages, the creation of new neurons slows down significantly. In order to maintain brain health and prevent degenerative diseases, new cells need to be continuously created. A 2008 study showed that low doses of CBD- and THC-like cannabinoids encouraged the creation of new nerve cells in animal models, even in aging brains. CBD also helps prevent other nerve-related diseases like neuropathy and Alzheimer’s disease.
Protects Against Bone Disease & Broken Bones
Cannabinoids are facilitative of the process of bone metabolism—the cycle in which old bone material is replaced by new at a rate of about 10 percent per year, crucial to maintaining strong, healthy bones over time. CBD in particular has been shown to block an enzyme that destroys bone-building compounds in the body, reducing the risk of age-related bone diseases like osteoporosis and osteoarthritis. In both of those diseases, the body is no longer creating new bone and cartilage cells. CBD helps spur the process of new bone-cell formation, which is why it has been found to speed the healing of broken bones and, due to a stronger fracture callus, decrease the likelihood of re-fracturing the bone (bones are 35–50 percent stronger than those of non-treated subjects).
Protects & Heals the Skin
The skin has the highest amount and concentration of CB2 receptors in the body. When applied topically as an infused lotion, serum, oil, or salve, the antioxidants in CBD (a more powerful antioxidant than vitamins E and C) can repair damage from free radicals like UV rays and environmental pollutants. Cannabinoid receptors can be found in the skin and seem to be connected to the regulation of oil production in the sebaceous glands. Cannabis-based topical products are being developed to treat related issues from acne to psoriasis and can promote faster healing of damaged skin. In fact, historical documents show that cannabis preparations have been used for wound healing in both animals and people in a range of cultures spanning the globe and going back thousands of years. The use of concentrated cannabis oils to treat skin cancer is gaining popularity with a number of well-documented cases of people curing both melanoma and carcinoma-type skin cancers with the topical application of CBD and THC products. Cannabis applied topically is not psychoactive.
Cannabinoids have been proven to have an anti-inflammatory effect in numerous studies. CBD engages with the endocannabinoid system in many organs throughout the body, helping to reduce inflammation systemically. The therapeutic potential is impressively wide-ranging, as inflammation is involved in a broad spectrum of diseases.
This article has been adapted from CBD: A Patient’s Guide to Medicinal Cannabis by Leonard Leinow & Juliana Birnbaum (Berkeley, CA: North Atlantic Books, 2017).
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