There's some confusion about terms here. Alcohol consumption and alcoholism are obviously related, but you can't make a perfect one to one equivalence between a country's alcohol consumption and its levels of alcoholism. A country where everybody has two or three glasses of wine a day could theoretically consume about as much alcohol as a country where most people don't drink but there's a sizable portion of the population who drink enormous quantities.
You can also be an alcoholic who drinks only wine or beer, and you can drink only spirits when you do drink, and not be an alcoholic.
As for the 23andme statistics, they now have a reference sample of over one million. The studies which some posters prefer are based on
far fewer samples. Those results are also much more valuable because their chart is based on the number of people
actually diagnosed with alcoholism, which is the point, not how much alcohol is consumed.
"Alcoholism or alcohol dependence is defined by the American Medical Association (AMA) as "a primary, chronic disease with genetic, psychosocial, and environmental factors influencing its development and manifestations."[h=3]Description[/h]
Alcoholism is characterized by:
- a prolonged period of frequent, heavy alcohol use.
- the inability to control drinking once it has begun.
- physical dependence manifested by withdrawal symptoms when the individual stops using alcohol.
- tolerance, or the need to use more and more alcohol to achieve the same effects.
- a variety of social and/or legal problems arising from alcohol use.
The effects of alcoholism are far reaching. Alcohol affects every body system, causing a wide range of health problems. Problems include poor nutrition, memory disorders, difficulty with balance and walking, liver disease (including cirrhosis and hepatitis), high blood pressure, muscle weakness (including the heart), heart rhythm disturbances, anemia, clotting disorders, decreased immunity to infections, gastrointestinal inflammation and irritation, acute and chronic problems with the pancreas, low blood sugar, high blood fat content, interference with reproductive fertility, increased risk of cancer of the liver, esophagus, and breast, weakened bones, sleep disturbances, anxiety, and depression. About 20% of adults admitted to the hospital (for any reason) are alcohol dependent. Men are more than twice as likely to be alcohol dependent than women, and smokers who are alcohol dependent are much more likely to develop serious or fatal health problems associated with alcoholism.
On a personal level, alcoholism, in many cases, leads to difficulties in marital and other relationships, domestic violence, child abuse or neglect, difficulty finding or keeping a job, impaired school or work performance, homelessness, and legal problems such as driving while intoxicated (DUI)."
http://medical-dictionary.thefreedictionary.com/alcoholism
So, genetics isn't the only factor. Stress and anxiety play their part, although again, the ability to handle both is probably partly genetic. People who have an extensive social support system are also less likely to be as depressed for as long than people in a culture where there is more isolation. Societal mores also have their effect. If your community punishes certain behavior, even it its only through ostracism, a good portion of the community won't engage in the behavior, lowering the statistics