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Tucker Carlson interviews Dr. Daniel Amen about cannabis, brain health, and broader public health trends. Amen cites his 1000-person marijuana study showing lower brain blood flow and activity across all examined regions in users compared with healthy controls, with measurable deficits on SPECT imaging that assess blood flow and mitochondrial function. He explains mitochondria as cellular energy producers and notes that 49% of the tracer in their imaging is taken up by brain mitochondria; thus, low activity on the scan reflects reduced mitochondrial function and blood flow. He also references a separate study from an independent group of 1000 young marijuana users showing reduced blood flow and activity in brain areas involved in learning and memory, aligning with his assertion that marijuana is not innocuous for the brain.
Amen lists consequences associated with reduced mitochondrial activity and blood flow: tiredness, low motivation, depression, increased anxiety (due to brain not settling), and, in vulnerable individuals, an increased risk of psychosis. He emphasizes that the connection between heavy marijuana use and psychosis is real and notes a genetic factor: a certain gene abnormality can lead to a sevenfold increase in the risk of psychosis in heavy users, with the general risk estimated at two to four times higher, particularly when use begins in youth. He argues that younger users face more brain development disruption and cites CDC data showing alarming mental-health trends among teens, including 57% of teenage girls reporting persistent sadness, 32% having thought of suicide, 24% having planned to kill themselves, and 13% having attempted it. He suggests marijuana contributes to this “mental mess,” though he acknowledges multiple factors.
Carlson pushes back on the view of cannabis as a medicine, prompting Amen to discuss how, while cannabis can help certain conditions (glaucoma, appetite stimulation), it is not universally beneficial and can increase anxiety in some users. Amen describes a “doom loop” in which pain and distress trigger automatic negative thoughts (ANTs), amplifying suffering and potentially leading to relapse or worse mental health outcomes. He argues that cannabis can blunt certain pain pathways but, when used chronically, reinforces dependence and prevents brain rehabilitation.
Amen contrasts marijuana with alcohol, describing rumors of “alcohol as health food” as a societal lie, noting recent statements by the American Cancer Society against any alcohol use due to cancer risk. He recounts experiences in psychiatry since the 1980s involving changes in attitudes toward gaming, alcohol, and drug policy, arguing that stimulants and sedatives (opiates, benzodiazepines) have historically created poor outcomes. He claims marijuana industry marketing aims to minimize perceived risk and accuses the industry of funding campaigns to mislead the public, similar to tactics used by historical industry players.
In discussing brain imaging, Amen highlights the cerebellum (the “little brain”) as crucial for both movement and cognitive processing. Marijuana’s effect on the cerebellum can slow thinking and impair coordination, which underpins the admonition not to drive high. He explains that cannabis acts on CB1 receptors and modulates dopamine, producing a high but potentially disrupting dopamine in vulnerable individuals, sometimes triggering psychosis.
Amen stresses the need to love and protect the brain, arguing that brain health should be prioritized in public policy. He advocates for preventing brain injury, reducing toxin exposure, maintaining sleep, exercise, and a healthy diet, and he introduces the Bright Minds framework: B = Blood flow; R = Retirement and aging (learn new things); I = Inflammation; G = Genetics; H = Head trauma; T = Toxins; M = Materials (personal products); I = Immunity; N = Neurohormones; D = Diabetes; S = Sleep. He explains how each factor affects brain health and how marijuana and obesity harm the brain by decreasing blood flow and increasing inflammation. He cites a study from the University of Pittsburgh showing overweight individuals have smaller brain volumes and older-appearing brains; obese individuals show even greater reductions. He notes that marijuana use lowers testosterone and can contribute to vascular problems, including a reported 600% increased heart attack risk for those over 50 who use marijuana.
On ADHD and youth, Amen describes using brain scans to differentiate toxic brains from those with genuine ADHD, emphasizing that stimulants are not the universal answer and that underlying toxicities must be addressed. He recounts a case where a child’s left temporal lobe cyst caused behavioral changes, which surgery ultimately improved after imaging revealed the physical cause. He argues for looking at brain pathology before labeling and treating, and he describes his broader mission to foster a national brain health revolution, encouraging people to ask whether their actions are good for their brain.
Amen also discusses psilocybin, kratom, and other substances, acknowledging potential therapeutic uses in specific contexts (psilocybin for PTSD/depression) while warning about risks such as unbalancing effects and the lack of standardized dosing in many studies. He notes a rising trend in mushroom use among youth and increasing emergency-room visits for psilocybin-induced psychosis. He cautions about the lack of regulation for kratom and its potential to worsen brain function, presenting it as another “weapon of mass destruction” in public health discussions.
Towards the end, Amen describes his clinical experiences with trauma, epigenetics, and intergenerational influences on mental health, stressing that thoughts, even disturbing ones, do not define character and can be managed through cognitive strategies such as cognitive behavioral techniques and reframing. He closes with a personal call to care for brain health, emphasizing practical steps like sleep, exercise, nutrition, vitamin D optimization, dental health, reducing toxin exposure, and mindful use of technology, including cautions about AI’s potential impact on cognitive function.