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National Academy of Sciences recommends vitamin intake

BOSTON, MASSACHUSETTS. The US National Academy of Sciences has released new recommendations for the daily intakes of vitamins and minerals. One major change concerns vitamin A. It was previously thought that darkly colored fruits and vegetables could provide adequate amounts of vitamin A through conversion of carotenoids. This has now been found to be untrue. Carotenoids are only converted to vitamin A at half the rate previously thought, so vegetarians in particular may need to increase their intake of vitamin A from other sources. The new recommendations also, for the first time, list tolerable upper intake levels (ULs) for many vitamins and minerals.
Recommended daily intakes (ULs in brackets) for adults in good health are as follows:

  • Vitamin A – 900 micrograms (4500 IU) for men and 700 micrograms for women (UL: 3000 micrograms)
  • Vitamin C – 90 mg (UL: 2000 mg)
  • Vitamin E – 15 mg (UL: 1000 mg)
  • Vitamin K – 120 micrograms for men and 90 micrograms for women
  • Choline – 550 mg for men and 425 mg for women (UL: 3500 mg)
  • Calcium - 1000-1300 mg (UL: 2500 mg)
  • Magnesium – 320-420 mg
  • Manganese – 1.8-2.3 mg (UL: 11 mg)
  • Molybdenum – 45-50 micrograms (UL: 2000 micrograms)
  • Selenium – 55-60 micrograms (UL: 400 micrograms)
  • Zinc – 8-11 mg (UL: 40 mg)

The report specifically points out that the recommendations are designed "to meet the needs of individuals in the United States and Canada who are healthy and free from specific disease or conditions that may alter their daily nutritional requirements."
Russell, Robert M. New micronutrient dietary reference intakes from the National Academy of Sciences. Nutrition Today, Vol. 36, May/June 2001, pp. 163-71

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