It seems that the Genetically altered (GM) corn from Monsanto causes disturbances in kidney function(male rats) and liver functions (female rats).
Monsanto had dismissed the same results in their own testing, due to the age of rats. This non-biased, scientific testing eliminated that, and other possibilities – stating that toxicity was a factor.
The GM corn varieties tested are in the food supply and feed supply of billions of people and animals.
Below is an excerpt showing which 3 GM corns were tested, and what their makeup is. Please note that they are altered to become tolerant to herbicide and insecticides (the herbicide and insecticides can be sprayed liberally on the GM corn without harming the corn itself):
” rats fed three main commercialized genetically modified (GM) maize (NK 603, MON 810, MON 863), which are present in food and feed in the world. NK 603 has been modified to be tolerant to the broad spectrum herbicide Roundup and thus contains residues of this formulation. MON 810 and MON 863 are engineered to synthesize two different Bt toxins used as insecticides.”
You may read (and I suggest you read) the entire study on the website of the International Journal of Biological Sciences below:
A Comparison of the Effects of Three GM Corn Varieties on Mammalian Health.