Beijing - Bra producers have been forced to offer bigger cup-sizes in China because improved nutrition is busting all previous chest measurement records.

"It's so different from the past when most young women would wear A- or B-cup bras," Triumph brand salesperson Zhang Jing told the Shanghai Daily from the Landmark Plaza of China's commercial hub.

"You... never expect those thin women to have such nice figures if they are not plastic."

The report, seen on the daily's Web site on Tuesday, said that the Hong Kong-based lingerie firm Embry Group no longer produces A-cups for larger chest circumferences and has increased production of C-, D- and E-cup bras to meet pressing demand.

The Beijing Institute of Clothing Technology released a report last week saying the average chest circumference of Chinese women has risen by nearly 1cm to 83,53cm since the early 1990s, the daily said.

This phenomenon, it said, was due to women eating more nutritiously and taking part in more sport.

Similar growth in the average height of children prompted a rethink last year in Beijing on the height allowance for free bus rides.