Nonheme-iron absorption from a phytate-rich meal is increased by the addition of small amounts of pork meat.
BACKGROUND
Muscle tissue from various sources is known to promote nonheme-iron absorption. However, systematic studies of the dose dependency of this effect of meat on iron absorption from an inhibitory meal with low amounts of meat are lacking.


OBJECTIVE
We investigated the dose-response effect of small amounts of meat on nonheme-iron absorption from a meal presumed to have low iron bioavailability.


METHODS
Forty-five healthy women with a mean (+/-SD) age of 24 +/- 3 y were randomly assigned to 1 of 3 groups, each of which was served (A) a basic meal (rice, tomato sauce, pea purée, and a wheat roll) and (B) the basic meal with either 25, 50, or 75 g pork (longissimus muscle). Meal A contained 2.3 mg nonheme iron, 7.4 mg vitamin C, and 220 mg (358 micro mol) phytate. Each meal was served twice, and the order of the meals was ABBA or BAAB. The meals were extrinsically labeled with (55)Fe or (59)Fe. Iron absorption was determined from measurements of (59)Fe whole-body retention and the activity of (55)Fe and (59)Fe in blood samples.


RESULTS
Twenty-five grams meat did not increase nonheme-iron absorption significantly (P = 0.13), whereas absorption increased 44% (P < 0.001) and 57% (P < 0.001), respectively, when 50 and 75 g meat were added to the basic meal. In absolute values, this corresponds to an absorption that was 2.6% and 3.4% higher, respectively, than that with the basic meal after adjustment of the data to a level of 40% absorption from a reference dose.


CONCLUSIONS
Small amounts of meat (>or=50 g) significantly increase nonheme-iron absorption from a phytate-rich meal low in vitamin C.
Baech
Sussi B
SB
Research Department of Human Nutrition, The Royal Veterinary and Agricultural University, LMC Center for Advanced Food Studies, Frederiksberg, Denmark.
Hansen
Marianne
M
Bukhave
Klaus
K
Jensen
Mikael
M
Sørensen
Sven S
SS
Kristensen
Lars
L
Purslow
Peter P
PP
Skibsted
Leif H
LH
Sandström
Brittmarie
B
D000328:Adult; D000818:Animals; D001682:Biological Availability; D003718:Denmark; D004032:Diet; D005260:Female; D005293:Ferritins / Q000097:blood; D006801:Humans; D007408:Intestinal Absorption; D008460:Meat; D019159:Nonheme Iron Proteins / Q000008:administration & dosage / Q000493:pharmacokinetics*; D010833:Phytic Acid / Q000008:administration & dosage* / Q000494:pharmacology; D013552:Swine
D019159:Nonheme Iron Proteins; D010833:Phytic Acid; D005293:Ferritins