So I was curious about the drink-limit idea, and did a little Googling. I see that in the UK, the doctors want to limit alcohol onboard aircraft, to protect people from DVT...
http://www.dailymail.co.uk/health/ar...-DVT-risk.html
The article adds: "The World Health Organisation is about to begin a four-year study on DVT and alcohol, with the first results expected within a year."