peptides are released from the milk proteins. Peptides, which are related to proteins and amino acids, help to control your blood pressure by impeding the enzymes that convert angiotensin. Angiotensin are made up of any of the three polypeptide hormones, one of which is a powerful vasoconstrictor (something that constricts a blood vessel). When the protein angiotensin gets converted to angiotensin II it constricts your arteries and increases the retention of water and sodium. This whole process has a rather adverse affect on your blood pressure – it pumps it right up!
You can stop the reaction that forces your blood pressure up by taking in the other peptides – those found in fermented milk products like cheese.
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