Alcoholic drink which contains a very high level of alcohol and "does not contain any added flavoring" is commonly called a neutral spirit. Generally, any distilled alcoholic beverage of 170 US proof or higher is considered to be a neutral spirit. Most yeasts cannot reproduce when the concentration of alcohol is higher than about 18%, so that is the practical limit for the strength of fermented drinks such as wine, beer, and sake. However, some strains of yeast have been developed that can reproduce in solutions of up to 25% ABV. Shot sizes vary significantly from country to country. In the United
Caffeinated alcoholic drink of regular alcoholic drinks and of caffeinated alcoholic drinks. The University of Florida surveyed 802 college students who had mixed alcohol and caffeine, and found they were three times more likely to leave a bar highly intoxicated and four times more likely to want to drink and drive than drinkers who did not consume alcoholic energy drinks. Another study surveyed 697 students from Wake Forest University and found that the students who had consumed caffeinated alcoholic drinks were more likely to drink and drive, take advantage of someone sexually, or end up needing medical treatment. From this perspective, it is