Many women may have long suspected it, just as many men have secretly hoped for it. But it’s official: women’s breasts, and particularly those of younger women, are getting bigger. While implants have been putting that little extra va-va-voom into some busts, mostly it’s a phenomenon that has occurred naturally in women, and exponentially so over the past 50 years. In fact, their cup size has tripled.

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The first theory is perhaps the most obvious. Women today are much better nourished than they were 50 years ago, eating more protein and fresh fruit and vegetables and having more variety in their food. Although we eat slightly less beef and a lot less lamb than we did in the 1960s, according to the CSIRO, we’re eating two to four times more pork and chicken per person, consuming a total of 290 grams of meat per person, per day. With such serious building blocks at hand, it’s little surprise that we’re usually taller than our mothers and have larger hips and bigger breasts.