Here's an article about why corn is bad for cattle:

https://www.lakeforest.edu/news/a-difficult-reality-to-digest-the-effects-of-a-corn-based-diet-on-the-digestive-system-of-cattle

>However, evolutionarily cattle are adapted to pasture diets not corn-based diets. Cattle have complex digestive systems, consisting of the rumen, the reticulum, the omasum, and the abomasums, which allow them to digest cellulose and hemicellulose found in grass blades. The addition of corn to the diet of a steer changes the chemistry of its digestive system and leads to serious illnesses, including bloat and acidosis. This illness, which is extremely painful for cattle, brings into question the ethics of feeding cattle a corn-based diet and the ethics of the policies surrounding corn production.

Here's one about corn and humans

https://www.healthline.com/nutrition/is-corn-good-for-you#downsides

>A study in 115 adults with obesity and type 2 diabetes found that eating a diet with only 14% of calories coming from carbs resulted in more stable blood sugars and a reduced medication need compared to getting 53% of the daily calories from carbs (16Trusted Source).

>A 24-year Harvard study in 133,468 adults found that each additional daily serving of corn was associated with a 2-pound (0.9-kg) weight gain per 4-year interval. Potatoes, peas and other starchy vegetables did not contribute to as much weight gain (18Trusted Source).