It might come as no surprise that coffee can help your mind feel sharper (goodbye, morning brain fog!), but did you know that coffee affects men and women differently? Men actually feel more alert more quickly than women do after drinking a caffeinated beverage, according to research from the University of Barcelona. In the study, men reported feeling less drowsy after only 10 minutes and sustained the mental boost for a half hour. Women got a "kick" from the espresso, too, but rated it weaker than the men did. But women, it turns out, are more influenced by the placebo effect when it comes to caffeine. Just anticipating the stimulating effects of caffeine may be enough to feel them. When the same researchers had participants drink decaf, women reported feeling significantly more alert than men, who reported just a slight boost.