http://fullyraw.com/be-fully-raw/what-is-fully-raw

It is ironic that many coffee drinkers on the Standard American Diet (SAD) criticize the raw diet because they believe they would not receive enough protein every day, while their daily intake of coffee blocks the absorption of the very protein they claim they need. This is because pepsin, an enzyme that digests protein, is inhibited when caffeine is consumed from any source.
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