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Light, but not heavy alcohol drinking, stimulates paraoxonase by upregulating liver mRNA in rats and humans - PubMed
Paraoxonase 1 (PON) may contribute to the cardioprotective action of high-density lipoprotein (HDL) because it inhibits low-density lipoprotein (LDL) oxidation, a prerequisite for the onset of atherosclerosis. Because light drinking and heavy drinking have diametrically opposite effects on...
Drink up boyos!
Responsibly, though. Light drinking (1-2 shots of moderate strength alcohol) will increase your serum paroxonase by up to 395% compared to non-drinkers, enough to compensate for the discrepancy in the OP study.
Getting shitfaced (>6 drinks per day), on the other hand, will lower it even further by up to 45% compared to non-drinkers. Not good.