Dietary Reference Intakes The Essential Guide to Nutrient Requirements (2006) / Chapter Skim
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Pages 340-349
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From page 340... ...
TABLE 1 Dietary Reference Intakes for Magnesium by Life Stage Group DRI values (mg/day) EARa RDAb AIc ULd,e males females males females males females Life stage group NDf 0 through 6 mo 30 30 7 through 12 mo 75 75 ND 1 through 3 y 65 65 80 80 65 4 through 8 y 110 110 130 130 110 9 through 13 y 200 200 240 240 350 14 through 18 y 340 300 410 360 350 19 through 30 y 330 255 400 310 350 31 through 50 y 350 265 420 320 350 51 through 70 y 350 265 420 320 350 > 70 y 350 265 420 320 350 Pregnancy £ 18 y 335 400 350 19 through 30 y 290 350 350 31 through 50 y 300 360 350 Lactation £ 18 y 300 360 350 19 through 30 y 255 310 350 31 through 50 y 265 320 350 a EAR = Estimated Average Requirement.
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From page 341... ...
PART III: MAGNESIUM 341 MAGNESIUM M agnesium is involved in more than 300 enzymatic processes in the body, as well as in bone health and in the maintenance of intracellu lar levels of potassium and calcium. Magnesium also plays a role in the development and maintenance of bone and other calcified tissues.
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From page 342... ...
DRIs: THE ESSENTIAL GUIDE TO NUTRIENT REQUIREMENTS 342 To a small extent, vitamin D appears to enhance intestinal magnesium ab sorption. The body's level of magnesium is maintained primarily by the kid neys, where magnesium is filtered and reabsorbed.
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From page 343... ...
PART III: MAGNESIUM 343 excessive magnesium intake have been observed with intakes from nonfood sources, such as various magnesium salts used for pharmacological purposes. Therefore, the UL for magnesium represents acute intake from pharmacological agents and does not include intake from food and water.
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From page 344... ...
DRIs: THE ESSENTIAL GUIDE TO NUTRIENT REQUIREMENTS 344 intake usually depends on calorie intake, which explains the higher intake lev els generally seen in young children and adult males and the lower intake levels seen in women and the elderly. Water is a variable source of magnesium intake.
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From page 345... ...
PART III: MAGNESIUM 345 TABLE 2 Continued Substance Potential Interaction Notes Calcium High intakes of calcium may Most human studies of the effects of dietary calcium decrease magnesium on magnesium absorption have shown no effect. absorption.
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From page 346... ...
DRIs: THE ESSENTIAL GUIDE TO NUTRIENT REQUIREMENTS 346 INADEQUATE INTAKE AND DEFICIENCY Severe magnesium depletion leads to specific biochemical abnormalities and clinical manifestations that can be easily detected. The potential effects of inad equate magnesium intake or deficiency include the following: • Symptomatic hypocalcemia (A prominent manifestation of magnesium deficiency in humans, symptomatic hypocalcemia develops when mag nesium deficiency becomes moderate to severe.
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From page 347... ...
PART III: MAGNESIUM 347 shopping for and preparing meals. It should also be noted that meals served by some long-term care facilities may provide less than the recommended levels of magnesium.
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From page 349... ...
PART III: MAGNESIUM 349 KEY POINTS FOR MAGNESIUM ✓ Magnesium is involved in more than 300 enzymatic processes in the body, as well as in bone health and in the maintenance of intracellular levels of potassium and calcium. ✓ The more magnesium consumed, the lower the proportion that is absorbed (and vice versa)
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