The amino acids that come from animal sources tend to make our cells rev up and multiply faster. For example, there is accumulating evidence that high consumption of proteins from dairy sources is related to a higher risk of prostate cancer. That chain of cancer causation actually seems pretty clear.

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Attribution

Quote text and notes from Wikiquote: Walter Willett (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.