(forgive me since I did not read your reference) but I recall there were some studies showing that the "health benefits" touted by the "glass of wine a day" studies were strongly correlated with:
- being middle to upper class (can afford a glass of wine daily)
- having good self control (drinking one glass of wine a day instead of many)
Even controlling for those factors, there is no health benefit to alcohol, ie a middle to upper class person with self control does not fare better drinking alcohol versus not drinking alcohol.
- being middle to upper class (can afford a glass of wine daily)
- having good self control (drinking one glass of wine a day instead of many)
which are both good health outcomes