I am the first to tell you that seed oils are bad for you. Conventional corn is a gmo crop and contains high Omega-6 fatty acids (versus Omega 3s). Soy is a whole other can of worms. Soy is a phytoestrogen meaning it mimics estrogen in the body (see the rise in feminized males in our culture) and it also contains higher Omega 6s than 3s. From high inflammation to genetic pesticides, GMOs have been questioned for human consumption, but what about animals?
Monogastrics like pigs and chickens have similar digestive systems to humans where food isn't fermented in the gut but their systems work similar to our where food goes in, gets broken down by bile and digestive enzymes then travels to intestines and out. There are many claims that feeding corn and soy to these animals in particular leads to high amounts of Omega 6s, the inflammatory one.
However, several studies have shown that pork produced using corn/soy free feed had the SAME amount of Omega 6s as pork raised without it. This is huge because the cost difference in feed is astronomical. A 50 pound bag of conventional swine grower is $12.50 while a 50 pound bag of non-gmo corn/soy free (not even totally organic, but thst label doesn't mean much anymore - more on that later) is $22.50. Ten dollars doesn't seem like a lot nowadays but when I'm buying 12 bags per month it's huge. $120 dollars that could go towards infrastructure or maintenance. $120 dollars that I won't recoup when selling the meat because everyone is so used to factory farmed prices that $10/lb pork seems unreasonable. $120 that doesn't make that much difference in the final product other than what our perception of health is. According to dirt-to-dinner.com, there isn't even a difference genetically in meat from GMO vs non-GMO fed animals.
After nearly 5 years of farming, I've come to realize it's a whole lot of gray in what used to be black and white thinking. I'm now less concerned about the "dangers" of corn and soy in feed and more concerned with how that animal was raised. I'm more concerned that the animal was raised holistically and free to roam than I am about how much money was spent on feed.