The effects of alcoholic drinks vary greatly because the rate of absorption and BACs attained vary from person to person due to factors such as weight, amount of fat tissue, and stomach contents. Nevertheless, various organizations have developed charts intended to help people estimate their BACs based on the number of drinks consumed. These tables can be used to estimate BACs, but they are subject to error. Some people can be substantially impaired after only two drinks. In addition, women can attain higher BACs and become more impaired than men who weigh the same and consume the same amount of alcohol because alcohol is processed differently by women and men.