It has been reported that vinegar, taken before a meal, can lower postmeal blood glucose. If so, the lowering of postmeal blood glucose by alcohol, as reported in your article, may be the result of the alcohol being metabolized to acetic acid by the body.

William Haag
Bloomer, Wis.

While both alcohol and vinegar lower blood glucose after a meal, they act through different pathways in the body. Vinegar lowers blood glucose by retarding the release of food from the stomach .—C. Barry