Many long-distance swimmers \"carb-load\" before an endurance event like a 5 km swim. carbohydrate loading involves eating carbohydrate-rich meals several days to one week before the event. in fact, many groups sponsor dinners the night before a race and serve high-carbohydrate foods like pasta. however, studies are mixed about the usefulness of this practice. one problem in practice is that it is difficult to consume such a high level of carbohydrates over several days. event distance is a factor. also, studies have failed to consistently show that performance – speed and/or endurance – improves, even when the diet is followed. although some athletes report improved performance, it is possible that this is a placebo effect. genetic and gender differences may also play a role. regardless of its efficacy, what is the reasoning behind carbohydrate loading?