Nitrates and nitrites are frequently added to processed meats like bacon, ham, sausages and hot dogs. They function as preservatives, helping to prevent the growth of harmful bacteria. They also add a salty flavour and improve the appearance of the meat products by giving them a red or pink color. Consuming processed meats is strongly linked to an increased risk of cancer in the digestive tract, and many people believe that the nitrates/nitrites are the reason for that cancer disease.