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Instead, excess protein is physiologically converted to an inefficient energy source or alternatively stored as fat. And concerning everyone, copious studies have established beyond doubt that over the long term, excess protein intake from animal-based sources can be harmful, significantly contributing to the onset of a variety of congenital diseases such as osteoporosis, cancer, impaired kidney function, and heart disease.
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Rich Roll (Finding Ultra: Rejecting Middle Age, Becoming One of the World's Fittest Men, and Discovering Myself)