When I pick up a packaged meat product at the store, like bacon or sandwich meats or ham steaks, I often see the label says 85% protein or something similar. Are not meat products all protein?
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Proteins are the functional components of cells used to carry out tasks, so protein content is directly proportional to the ratio of cells to extracellular matrix, fatty tissue, and tissue cellularity. Some tissues just have comparatively less cells by mass, and the cells themselves contribute various biomolecules like cholesterol, carbohydrates, etc when broken down as food.
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