Assertion: whey | /r/HasProperty | excellent source of protein
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text: Because whey is an excellent source of protein the cheesemaking companies began marketing their leftover product to companies which make protein-enriched products such as protein shakes and bars.
text: MayoClinic.com says, whey is an excellent source of protein, and the Whey Protein Institute calls it the "gold standard" of protein because it helps athletes develop a lean, well-defined physique.