Marijuana use over time is inversely related to obesity, according to a new study published in the International Journal of Epidemiology.

For the study researchers assessed the relationship between cannabis use and body mass index (BMI) over time in a nationally representative sample of 33,000 subjects.

Investigators reported that cannabis-using subgroups exhibited “appreciably attenuated BMI gain” over the trial period as compared to non-users and quitters, “with the largest attenuation seen in the ‘persistent use’ group.”

They concluded: “This new prospective study builds from anecdotes, pre-clinical studies and cross-sectional evidence on inverse associations linking cannabis use and obesity and shows an inverse cannabis–BMI increase association. Confirmatory studies with rigorous cannabis and BMI assays will be needed.”

The full abstract of the study states:

Background

Pre-clinical studies indicate increased food intake and weight gain as cannabinoid effects. Cross-sectional epidemiological studies, however, indicate lower prevalence of obesity among cannabis users. Here, we aim to study the weight-gain research question in the prospectively conducted National Epidemiologic Survey on Alcohol and Related Conditions (NESARC).

NESARC was designed to produce nationally representative estimates for the US population. Participants (aged 18+) completed computer-assisted personal interviews on cannabis use, body weight and height at Waves 1 (W1, 2001–02)

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