Might be about straw shortener? Seems to somehow have become a hot topic again in some circles.
For those not i the know, popular growth regulators used to shorten straws, as to prevent lodging during rains, has been known to cause hormone imbalances in humans, such as reduced fertility rates of men. Not sure if the growth regulators still are this dangerous, but they have been, and still are, banned in some countries.
It's an antimeme. The original meme is meant to show 2 separate, unrelated objects, with the implication that the first thing was destroyed in the process of creating the second object. In this case, the first object (wheat) really is used to create the second object (bread), hence the antimeme