Study: Cannabis, Alcohol Rapidly Increase Brain Ageing
In the largest known brain imaging study, scientists evaluated 62,454 brain scans of more than 30,000 individuals from 9 months old to 105 years of age to investigate factors that accelerate brain aging, finding cannabis and alcohol usage had a particularly negative influence.
The scientists were from Amen Clinics (Costa Mesa, CA), Google, John’s Hopkins University, University of California, Los Angeles and the University of California, San Francisco.
The study used SPECT tomography, which evaluates regional cerebral blood flow in the brain that is reduced in various disorders.
Lead author, psychiatrist Daniel G. Amen, MD, founder of Amen Clinics, said: “Based on one of the largest brain imaging studies ever done, we can now track common disorders and behaviors that prematurely age the brain.
“Better treatment of these disorders can slow or even halt the process of brain aging.
“The cannabis abuse finding was especially important, as our culture is starting to see marijuana as an innocuous substance. This study should give us pause about it.”
Researchers studied 128 brain regions to predict the chronological age of the patient.
Older age predicted from the scan compared to the actual chronological age was interpreted as accelerated aging.
The study found that a number of brain disorders and behaviors predicted accelerated aging, especially schizophrenia, which showed an average of 4 years of premature aging, cannabis abuse (2.8 years of accelerated aging), bipolar disorder (1.6 years accelerated aging), ADHD (1.4 years accelerated aging) and alcohol abuse (0.6 years accelerated aging).
Interestingly, the researchers did not observe accelerated aging in depression and aging, which they hypothesize may be due to different types of brain patterns for these disorders.