I know on a biochemical level, that if you introduce a toxin to the body, the liver will become much more active, and in turn will purge other toxins. For example, in TCM, people who have really bad psoriasis are often viewed as having built up toxicity in the body. We treat it by introducing some toxic herbs which kick the liver into high gear. Through purging the toxic herbs, other oxidants in the body get purged, and the skin clears up. Often, these herbs are introduced to the body through alcohol solutions, like warmed rice wine, because the alcohol will enter the liver directly and carry the herbs with it.
People who drink regularly surely have higher liver enzyme levels, which is why moderate drinking would bring some benefit to the body. But you'll notice that heavy drinkers come in second, because the alcohol toxicity begins to cancel out the detoxing effects; and of course, non-drinkers don't have boosted liver metabolism at all.
:rofl
