Japanese women breast sizes massively increase over four decades

Research regularly shows that Japanese women’s breasts are getting larger. And now we have data to prove it over a 40-year period.

Bra maker Triumph — known for its rather silly concept bras — nonetheless takes mammaries seriously, as you’d expect, and knowing the size of its customers’ boobs are inevitably top of its list of priorities.

It recently made public the results of a survey it did. Here are the key findings.

The subjects of the survey were Japanese females between the ages of 20 through 60 years. And when the data was confirmed, Triumph found that while only 4.5% of its customers had required a D-cup size bra or larger back in 1980, that percentage had expanded to 17.6% by 1990. By 2018, the percentage had swelled impressively to 53.1%. Or in other words, a remarkable twelve-fold increase over 40 years.

Interestingly, the 17.5 centimeter average measurement from the underside of the breast to the top had not shown any appreciable change during those four decades. Which means the size of the breasts themselves had definitely become larger.

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A press report tried to figure out why and got this juicy quote.

“There are two reasons for this,” said Shuko Sakata, manager of brand marketing at Triumph. “The first is changes in the diet, such as increased meat consumption and westernization in general. The other is because we manufacturers have become better at teaching customers the correct way to select a brassiere. When putting on their bras, women tend to lean forward and by so doing gravity collects fleshy parts on the sides of their torso to fill up the cup. That alone can increase cup size by as much as two sizes.”

Fewer and fewer women wear kimonos, which means their breasts are not flattened down. Given room to breath under western clothing, the results are beautiful. The dietary changes are also apparently important for around 20% of the size of a breast; the rest is determined by genetics.

Whatever the particulars of the science, though, this is a trend that we support wholeheartedly.

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