Vitamin A overdose ΓΈ Calorie Counter
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Vitamin A overdose


The medical name of vitamin A excess is "hypervitaminosis A". Hypervitaminosis A occurs when the maximum limit for liver stores of retinoids is exceeded. The excess vitamin A enters the circulation causing systemic toxicity.

Vitamin A is used in the body for vision, immunity and bone and tissue growth and maintenance. Excessive Vitamin A use during pregnancy may increase the risk of birth defects. Vitamin A overdose can cause symptoms such as orange skin, blurred vision and nausea. Vitamin A toxicity can cause more severe symptoms such as growth retardation, hair loss and enlarged spleen and liver and even death.

Retinol and beta carotene both belong to the Vitamin A family. The body automatically removes excess beta carotene so it is impossible to overdose on this type of Vitamin A.

Hypervitaminosis A can cause:
  • Birth defects
  • Liver problems
  • Reduced bone mineral density that may result in osteoporosis
  • Coarse bone growths
  • Skin dryness/peeling
Although hypervitaminosis A can occur when very large amounts of liver are regularly consumed, most cases of Vitamin A toxicity result from an excess intake of Vitamin A in supplements.

The Institute of Medicine has established Daily Tolerable Upper Levels (UL) of intake for vitamin A from supplements that apply to healthy populations. The UL was established to help prevent the risk of vitamin A toxicity or overdose. The risk of adverse health effects increases at intakes greater than the UL. You can easily check levels of Vitamin A for any type of food by looking into "Vitamins" tab on Food Details page (for example: Fried Beef Liver).

The UL does not apply to malnourished individuals receiving Vitamin A either periodically or through fortification programs as a means of preventing deficiency. It also does not apply to individuals being treated with Vitamin A by medical doctors for diseases such as retinitis pigmentosa.

References


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