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 as caffeine can mask some of the sensory cues individuals might normally rely on to determine their level of intoxication. The consumption of this drink and the delayed intoxication impairment could lead to negative consequences such as the increased stimulation and intoxication levels while decreasing the ability to operate a motor vehicle. The US Food and Drug Administration (FDA) has looked at peer-reviewed studies and has come to the conclusion that risky behaviors which could lead to life-threatening situations are directly correlated with the consumption of caffeinated alcoholic drinks. Universities have conducted studies to compare the outcomes of the consumption