Interesting that this has come up. Thank you Minimus for a topic for a change instead of being the JWN wall flower.
This past spring, I had some medical concerns that took me through about 5 weeks of tests and visited with various doctors through the Providence Health facility nearby.
One question that I kept being asked routinely was "How many drinks per day do you consume?" The list was always the same - Beer___? Wine___?
Liqour____?
I always answered honestly. I drink liqour more than wine and seldom drink beer.
Then towards the end of the five weeks of running up medical bills (and coming to no conclusions, but that's another story) I asked the doctor, "I know a beer is about 12 oz of 5% alchohol. Wine is about 11% for a 5 oz. glass. But how much is what you call a "drink" of liqour? She looked at her own questionaire and said, "that's a good question, let me check" she took a few seconds on the computor and said "one drink of 80% liqour is considered to be 1.5 oz." Nonsense. A drink is a 1 oz. shot. Recognized everywhere. Many bars have automatic liqour dispensers that measure one ounce. If you go into a pub in the UK you see the liqour bottles all upside down on top of measuring nozzles. All one ounce.
So all this time I have told them how many drinks I consume per day they have calculated it at 1.5 instead of 1.0.
The whole subject of drinking and health effects is a muddle of opinions, prejudices and hunches.