Excess animal protein promotes kidney, eye, and brain diseases; autoimmune disorders; obesity; heart disease; diabetes; osteoporosis; and cancer. A 2014 study in Cell Metabolism found that people who ate a diet rich in animal proteins were more than four times as likely to die of cancer as those who ate a low-protein diet. In addition, those who consumed diets high in animal proteins were several times more likely to die of diabetes, as well as 74 percent more likely to die prematurely from any cause. A high-animal-protein diet disrupts hormonal balance by increasing the ratio of estrogens in
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