Final answer:
Feeding cows a corn-based diet is problematic because it can lead to health issues, while feeding them grass and other grains is more natural and healthier.
Step-by-step explanation:
In Food Inc., feeding cows a corn-based diet is problematic because it can lead to several health issues for the cows. Cows are herbivores and their digestive systems are designed to process grass and other grains. When cows are fed primarily corn, it can cause digestive problems and make them more susceptible to illnesses.
On the other hand, feeding cows grass and other grains is more natural and healthier for them, as it provides the necessary nutrients they need to thrive.