Final answer:
Alcohol intake may be higher among first-generation Mexican Americans born in the U.S. compared to Mexican Americans born in Mexico, but the exact percentage increase is unknown.
Step-by-step explanation:
The question asks about the increase in alcohol intake between Mexican Americans who were born in Mexico and first-generation Mexican Americans born in the U.S. We don't have specific data on this comparison, but we do have information about alcohol consumption in different countries. For example, the per capita consumption of pure alcohol in Mexico is 5.3 litres, while in Austria, Ireland, and France it is about 12 litres. Based on this information, we can infer that alcohol intake may be higher among first-generation Mexican Americans born in the U.S. compared to Mexican Americans born in Mexico, but we cannot determine the exact percentage increase.