柔道是體重分級的項目，許多選手相信賽前急速減量可以爭取場上的身材優勢，因此急速減重行為在柔道選手當中相當普遍。由於大多數的急速減量都使用限制飲水、限制食物或強迫脫水等方式達到顯著的效果，因此急速減重對健康很不利，也會導致對肌力或肌耐力的負面影響。不過，因為急速減重對表現的影響可以在短時間內恢復，因此許多選手仍願意冒著健康的風險換取表現的優勢。這種對選手健康不利的情況必須使用制度規範來矯正。

Judo is an event with weight classes. Many athletes believe that rapid weight loss can give them advantages to compete against smaller opponents. Thus, rapid weight loss is very prevalent among Judo athletes. Most of the rapid weight loss methods involve restricted fluid intake, restricted diet or dehydration, which is extremely harmful to health, and may result in negative effects on muscular strength and endurance. However, because the negative effects of rapid weight loss can be reversed within several hours, many athletes are still willing to conduct rapid weight loss even with high healthy risks. This situation should be corrected by setting up regulations.