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The fluoride ion is present in body tissue in trace amounts and helps prevent tooth decay. Drinking water is the main source of flour and fish is also a good source. If fluorine is taken in excessively high doses for a long time, it is toxic. Too much flour in a form of supplements can cause fluorosis, a mottling of tooth enamel.
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Fast food operations make extensive use of iodized salt and iodates they are used by some bakeries as dough conditioners. Symptoms of toxic levels are similar to those resulting from deficiency, from an enlarged thyroid gland.
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Copper helps in the utilization of iron in the synthesis of hemoglobin and is required by some of the body’s enzyme systems. It can be toxic in high concentrations and this can be achieved if copper Containers are used for storing or distributing acidic foods (copper tubes in machines that dispense lemonade or other acidic drinks). The disadvantages are practically unknown and some food sources are fruits, beans, peas, eggs, liver, fish, and oysters.
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Epithelial cells (these cells present in the lining of body cavities and in skin and glands) also require vitamin A. Vitamin A deficiency can cause a disorder in bone formation, deterioration of night vision, poor function of epithelial tissues, and defects in tooth enamel.