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. The Potrykus group said the rice contained 1.6 micrograms (µg) beta-carotene per gram (g), but thought 2 µg/g realistic. The U.S. standard for vitamin A is 300 µg per day for children aged one to three years, 700 µg for adult women, and 900 µg for adult men. At a conversion rate of 12 µg beta-carotene to 1 µg vitamin A, the beta-carotene standard is 3,600 (12 × 300) µg for young children; 8,400 (12 × 700) µg for women; and 10,800 (12 × 900) µg for men. If Golden Rice contains 2 µg per g beta-carotene, the amounts are halved. Children would need to eat 1,800 g rice (4 lb); women 4,200 g (9 lb); and men 5,400 g (12 lb) a day to meet the U.S. standard for vitamin A. Rice is cooked in twice its volume of added water (example: 1 cup raw rice plus 2 cups water to yield 3 cups cooked rice). Therefore, the amounts of
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