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In the United States, nutritional deficiencies have generally been replaced by dietary imbalances or excesses associated with many of the leading causes of death and disability. Overnutrition results from eating too much, eating too many of the wrong things, not exercising enough, or taking too many vitamins or other dietary replacements.

Risk of overnutrition is also increased by being more than 20% overweight, consuming a diet high in fat and salt, and taking high doses of:

  • nicotinic acid (niacin) to lower elevated cholesterol levels
  • vitamin B6 to relieve premenstrual syndrome
  • vitamin A to clear up skin problems
  • iron or other trace minerals not prescribed by a doctor

Nutritional disorders can affect any system in the body and the senses of sight, taste, and smell. Malnutrition begins with changes in nutrient levels in blood and tissues. Alterations in enzyme levels, tissue abnormalities, and organ malfunction may be followed by illness and death.

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Science EncyclopediaScience & Philosophy: Macrofauna to MathematicsMalnutrition - Overnutrition, Causes And Symptoms, Diagnosis, Treatment, Prognosis, Prevention