No. I don't. But I bet the first women to figure it out was a Farmers Wife. I was thinking "How did we ever figure this out?" AND my hypothesis is that some poor women was put back out in the garden to pick crops weeks after birth and harvesting cabbage affected her supply. And she told two friends and then someone ELSE noticed it...and finally someone wanted to STOP milk production and someone else said "Well if just being around all this cabbage affects supply, what would happen if you actually put it right against the boob???" And there you have it. An old Wives tale is born.
Just like....who figured out that too much Vitamin C will make you miscarry?