It is assumed that the gain in fat-free mass in pregnancy (7.5 kg) is associated with a greater deposition of magnesium. If this tissue contains 470 mg/kg, after adjustment for a bioavailability of 40%, the EAR is an increase of 35 mg/day for pregnant women of all ages, and the RDA is 10% higher than this; for women aged 14-18 years, the EAR and RDA respectively are 335 and 400 mg; for those aged 19-30 years, these values are 290 and 350 mg; and for those 31-50 years, they are 300 and 360 mg. In the United Kingdom, there is no increment for magnesium in pregnancy based on the assumption that phosphorus metabolism becomes more efficient to meet fetal needs.
The UL for magnesium in pregnancy is set at 350 mg/day taken as a supplement, based on the potential for higher doses of magnesium salts to cause an osmotic diarrhea.
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