Fasting insulin levels - recorded between meals - were significantly reduced in all the three diet groups.

BBC: NEWS | Health | Low-cal diet 'long-life benefits'

That drug, rimonabant, produced significant weight loss and a drop in fasting insulin levels by affecting certain cannabinoid receptors in the exact opposite way that THC, marijuana's main psychoactive ingredient, does.

CNN: Marijuana: The next diabetes drug?

Even after these adjustments, the current marijuana users showed fasting insulin levels that were 16% lower than those of former or never users, along with a 17% reduction in another measure of insulin resistance as well.

CNN: Marijuana: The next diabetes drug?