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How do enzymes work in our bodies?

When we eat raw foods, the enzymes in the food are activated by heat and moisture in the mouth.  Once active, these enzymes digest all of our food and make it small enough to pass through the villi (small pores of the intestines) and into the blood.  The metabolic enzymes found in the blood then take the digested 45-known nutrients and build them into muscles, nerves, bones, blood, lungs, and various glands.  Every cell in the body depends on certain enzymes.  A protein digestive enzyme will not digest a fat, a fat enzyme will not digest a starch (carbohydrate).  Each enzyme has a specific function in the body; this is referred to as enzyme specificity.  Enzymes act upon chemicals and change them into other chemicals, but enzymes themselves remain unchanged.  Simply stated, our chemicals are changed from their original identity by the enzyme to other chemicals with a different identity.  Without enzymes nothing in our body would work.