Why are Japanese boxers losing up to 12% of body weight?

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Extreme Weight Cutting Practices in Japanese Boxing

Japanese boxers are engaging in extreme weight-cutting practices, losing between 10 to 12 percent of their body weight in just a few days. This rapid dehydration before weigh-ins, followed by rehydration before the fight, is considered dangerous by the World Boxing Association, which states it increases the brain's susceptibility to bleeding. The Japan Boxing Commission (JBC) secretary-general, Tsuyoshi Yasukochi, has noted that this practice has become widespread in Japan only in recent years, and its safety implications are not fully understood.
Significant Weight Loss Raises Safety Concerns

The extent of weight loss observed among Japanese boxers has significantly increased, raising serious safety concerns. Previously, the JBC presented figures indicating a maximum recommended body weight loss of two to four percent. However, current practices see boxers losing as much as 10 to 12 percent of their body weight in a short period. This drastic reduction is believed to be a contributing factor to the increased risk of brain injuries, as highlighted by the World Boxing Association's assessment of heightened susceptibility to bleeding.
Potential Regulatory Adjustments Under Consideration

In response to the escalating risks associated with extreme weight cutting, boxing authorities in Japan are contemplating new rules. Proposals include mandating that fighters who regain more than 10 percent of their body weight must move up to a heavier weight class for their subsequent bout. This measure aims to discourage the dangerous practice of excessive dehydration and rehydration. Unlike some other boxing jurisdictions, Japanese officials currently have limited enforcement power, being able only to issue warnings to fighters whose weight changes drastically between weigh-in and fight.
Broader Safety Measures Being Explored

Beyond weight-cutting regulations, other safety aspects of Japanese boxing are also under review. The intensity of sparring sessions in Japan is noted to be significantly higher than in other countries, with JBC chief Yasukochi suggesting that Japanese boxers often adopt an all-out attack strategy from the beginning of a bout, potentially at the expense of defensive skills. This aggressive approach, coupled with the extreme weight cuts, is seen as a potential reason for fighters sustaining more damage. Discussions are also underway regarding other safety protocols, such as improving ambulance availability and the use of MRI scans.

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Why are Japanese boxers losing up to 12% of body weight?

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