Sources Of Cadmium
The most common sources of cadmium toxicity are foods such as rice and wheat which are grown in soil contaminated by sewage sludge, super phosphate fertilizers and irrigation water.
Large ocean fish such as tuna, codfish and haddock concentrate within their tissues relatively large amounts of cadmium. Oysters, although containing large amounts of cadmium also contain large amounts of zinc which serves to protect against cadmium toxicity.
Besides contaminated produce and organ meats such as liver and kidneys, a significant source of cadmium toxicity is a diet high in refined foods. Zinc, which normally protects against the toxic effects of cadmium, is largely removed during the milling process, leaving cadmium behind.
Candies, Processed And Refined Foods
Many processed foods have had the protective elements zinc and calcium removed in the refining process. Cadmium, however, remains and is readily absorbed since the zinc and calcium are not available to compete for absorption.
Cadmium may also be used as plating material in food-processing plants, thereby finding its way into processed food products. Processed meats, refined grains, instant coffee and cola drinks are among the most common sources of cadmium toxicity.
Widespread use of white flour and white rice, along with causing various vitamin and mineral deficiencies, contribute to cadmium toxicity by their high cadmium/zinc ratio. An excessive carbohydrate intake also serves to reduce tissue zinc levels, further aggravating a cadmium toxicity problem.
Solder used to seal cans is a common source of cadmium.
Cadmium used in industry finds its way into many water supplies. Soft water is more dangerous since the calcium in hard water has a protective effect. Old galvanized pipes and new plastic (PVC) pipes are sources of cadmium in our drinking water.