Um... antibiotics don't treat the "side effects of too much corn" (?!).  They're given to animals to prevent (or sometimes treat, but usually just to prevent) bacterial infections that are spread between animals being kept in otherwise infection-prone environments.<p>It's true that in modern farms "grass fed" is usually synomymous with "pasture-kept", where the animals spend time wandering with lots of space instead of crushed against each other at feeding troughs.  So to some extent corn-feeding probably correlates with infection rates, I guess.<p>But just to be clear: eating corn doesn't make you sick.  It's not true for people and it's not true for cows. :)