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					Originally Posted by skier
					
				 
				Whey protein, being an animal (dairy) protein, contains several essential amino acids that your body cannot produce/create on it's own. We need these proteins to build muscle. If you take just soy protien, it's like eating peanut butter- you'll get plenty of protein, just not the right kind for your body. 
			
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 I second what Skier has said here. Whey contains the amino acids that are essential for muscle growth. This is the main reason for increasing protein intake anyways.