The November issue of Discover (not online yet) has an article about bra research and design. In the past 15 years, women have generally increased one bra size due to obesity, implants, and estrogens from birth-control.
A pair of D-cup breasts weighs between 15 and 23 pounds — the equivalent of carrying around two small turkeys. The larger the breasts, the more they move and the greater the discomfort.
–Anne Casselman, Force=Mass x Acceleration, Discover
This can be a deterrent to exercise, and lack of activity can lead to increased buxomness. According to the article, the U.S. sold more than $5 billion worth of bras in 2001. Every woman should experience the comfort of good support, so I’m all for better design.
This is the BEST sports bra EVER…
http://www.enell.com/
It’s expensive, but well worth it!
Thanks for the link! I looked into it, and I may just invest. 🙂
Another reason for some women increasing is breast feeding. My wife started out as an A, maybe a B cup and is now a solid C cup after breast feeding almost continuously for 13 years. She is still trim and very fit so obesity isn’t the issue for her.