Consumption of cow's milk as a cause of iron deficiency in infants and toddlersnure_
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1 Consumption of cow's milk as a cause of iron deficiency in infants and toddlersnure_ Ekhard E Ziegler Consumption of cow's milk (CM) by infants and toddlers has adverse effects on their iron stores, a finding that has been well documented in many localities. Several mechanisms have been identified that may contribute to iron deficiency in this young population group. The most important of these is probably the low iron content of CM, which makes it difficult for infants to obtain the amounts of iron needed for growth. A second mechanism is the occult intestinal blood loss associated with CM consumption during infancy, a condition that affects about 40% of otherwise healthy infants. Loss of iron in the form of blood diminishes with age and ceases after the age of 1 year. A third mechanism is the inhibition of non-heme iron absorption by calcium and casein, both of which are present in high amounts in CM. Fortification of CM with iron, as practiced in some countries, can protect infants and toddlers against CM's negative effects on iron status. Consumption of CM produces a high renal solute load, which leads to a higher urine solute concentration than consumption of breast milk or formula, thereby narrowing the margin of safety during dehydrating events, such as diarrhea. The high protein intake from CM may also place infants at increased risk of obesity in later childhood. It is thus recommended that unmodified, unfortified CM not be fed to infants and that it be fed to toddlers in modest amounts only International Life Sciences Institute INTRODUCTION Infants and toddlers are exceedingly vulnerable to iron deficiency (ID) because their natural diet tends to be low in iron, while at the same time, their needs for iron are unusually high due to rapid growth. The iron endowment at birth initially supplies all the iron needed for growth. But when the iron endowment becomes exhausted at around 4 6 months of age, dietary iron becomes the sole source of iron for growth. Staples of the infant and toddler diet, including breast milk, vegetables, fruits, and cow s milk (CM) are all low in iron. In fact, without iron fortification it is quite difficult for infants and toddlers to obtain an adequate iron intake. Although iron-fortified foods such as cereals and infant formulas are available, they are not universally used for economic as well as cultural reasons. COW'S MILK AND THE OCCURRENCE OF IRON DEFICIENCY In infants and toddlers an association between poor iron status and even outright ID has been observed consistently in many localities. By what mechanism CM affects iron status is not entirely clear. Although the main mechanism seems to be the low iron content of CM, other mechanisms, such as intestinal blood loss and inhibition of iron absorption are playing contributory roles, albeit of uncertain magnitude. Since the 1970s, many studies have shown that the feeding of CM to infants (and to young children) is strongly associated with diminished iron stores and an increased probability of ID. Many of these studies were conducted in the United States 1 6 and the United Kingdom, 7 11 but studies have also been reported from Affiliation: EE Ziegler is with the Fomon Infant Nutrition Unit, Department of Pediatrics, University of Iowa, Iowa City, Iowa, USA. Correspondence: EE Ziegler, A-136 MTF, Oakdale Research Park, 2501 Crosspark Road, Coralville, IA , USA. ekhard-ziegler@uiowa.edu, Phone: , Fax: Key words: cow's milk, food fortification, iron deficiency doi: /j x S37
2 Denmark, 12 Australia, 13 Ireland, 14 Sweden, 15 Iceland, 16 and a cross-section of European countries. 17 A study by Male et al. 17 involved 488 healthy infants in 11 different European countries. When iron status was assessed at 12 months of age, 7.2% of the subjects were iron deficient and 2.3% had iron deficiency anemia. Feeding of CM was a strong determinant of iron status, with each month of CM consumption increasing the risk of ID by 39%. In a study performed in Iceland involving 180 healthy infants, iron status at 12 months of age was found to be strongly negatively associated with CM consumption between 9 and 12 months of age. 16 The iron status of infants in the highest quintile of milk consumption was significantly worse than that of infants consuming lesser amounts of CM. Thus, the negative effect of CM on iron status is dose-dependent rather than all-or-none. This suggests that small amounts of CM may be consumed without a negative effect on iron metabolism. In most studies, the iron status of infants fed CM was compared with that of infants fed formula, which was usually fortified with iron. However, in two studies the comparison was with formulas that were not fortified with iron. 1,2 Feeding with these formulas still led to better iron nutritional status than feeding with CM. These studies thus provide evidence that CM affects iron status adversely, not just through its low iron content, and suggest that additional mechanisms are involved in determining iron status. The relative importance of these mechanisms cannot be determined from existing data. While it appears that the low iron content of CM is most important, it is likely that all three mechanisms act in concert to produce ID. MECHANISMS BY WHICH COW'S MILK AFFECTS IRON METABOLISM Low iron content of cow's milk The iron content of CM is about 0.5 mg/l and is thus comparable to that of human milk. Like human milk, CM alone cannot meet the iron needs of infants or toddlers regardless of the amount of CM consumed. The Institute of Medicine 18 has estimated that the growing infant needs to have a net iron gain of 0.7 mg per day, and therefore needs to take in 7 mg of iron every day; the toddler needs to take in 11 mg/day. If the availability of iron from CM were assumed to be 10%, the infant would have to consume 14 L of CM every day to meet iron requirements. Clearly, neither infants nor toddlers can depend on CM to meet their iron needs. Rather, infants and toddlers depend on other foods or iron supplements to meet the body s demands for iron. In contrast, formulas that have iron concentrations between 6 and 12 mg/l easily meet infants iron needs. Most complementary foods are low in iron unless they are fortified with iron. Fruits and vegetables are also low in iron content. Only meats and meat-containing infant foods contain appreciable amounts of iron, but they are only sparingly consumed by infants. Infant cereals and, to some extent, cereals for older children are, at least in the United States, fortified with iron and are the primary source of iron for infants and toddlers. Given this dependency on certain complementary foods to ensure the necessary iron intake, it is not too surprising that infants and toddlers fed CM are at risk of ID. Occult intestinal blood loss Healthy infants lose small quantities of blood in their feces at all times. Using the radiochromium ( 51 Cr) technique, in which erythrocytes are withdrawn from the subject, labeled in vitro with 51 Cr, and then reinjected into the subject before feces are collected and examined, quantitative determination can be made of the amount of blood lost in feces. Using this technique, Elian et al. 19 found that blood loss averaged 0.59 ml/day in infants hospitalized for various non-intestinal infectious illnesses. Each infant had measurable blood loss. Wilson et al. 20 were the first to recognize that the feeding of CM to infants and toddlers can lead to an increase in intestinal blood loss. In a subgroup of a cohort of infants and toddlers with ID, they found a clear and reproducible increase in fecal blood loss associated with the feeding of CM. Infants with consistent CM-induced blood loss lost, on average, 1.7 ml of blood each day. When the same subjects were fed formula (milk-based or soy-based), blood loss decreased to 0.3 ml/day. Blood loss of 1.7 ml/ day is equivalent to iron loss of 0.53 mg/day, which, if it is not causing outright negative iron balance, makes it, at the least, very difficult for the infant to achieve the 0.7 mg/day net iron gain that is necessary to prevent iron depletion. To answer the question of whether iron-sufficient infants can also have occult intestinal blood loss when fed CM, Fomon et al. 21 randomly assigned healthy 4-monthold infants to pasteurized CM, heat-treated CM (heattreated to the same extent as ready-to-feed infant formula), or iron-fortified infant formula. Between 112 and 196 days of age, stool specimens were collected weekly and tested for the presence of blood using the guaiac test. During the first 4 weeks of the trial, 39% of infants fed pasteurized CM had one or more guaiacpositive stools and 17% of all stools were guaiac positive. In contrast, among infants fed formula or heat-treated CM, only 9% of infants had one or more guaiac-positive stools (P < 0.01) and only 2.4% of all stools were guaiac positive (P < 0.001). There were no differences in iron nutritional status, possibly because iron intake was generous in all groups. S38
3 Figure 1 Fecal hemoglobin concentration in infants fed formula and infants fed CM beginning at 168 days of age. Drawn from data of Ziegler et al. 22 The study by Fomon et al. 21 provided no information about the quantity of blood lost during feeding with CM, and it involved relatively young infants. A subsequent study of similar design employed a quantitative method for the determination of fecal hemoglobin. 22 Also, it initiated the feeding of CM at a later age (5 ½ months). One group of healthy infants was fed CM and a second group was fed iron-fortified milk-based formula. Infants had initially been breastfed or had been fed milk-based or soy-based formulas, but for at least 1 month before entering the trial all infants were fed a milk-based formula.as in the earlier study, the percentage of guaiac-positive stools rose from a baseline of 3% to 30% during the first month of feedingwithcm(p < 0.01), whereas among infants fed with formula the proportion of guaiac-positive stools remained low (5%). The mean stool concentration of hemoglobin increased from 622 mg/g dry stool at baseline to a mean of 3,598 (standard deviation 10,479) mg/g dry stool during the first month of feeding with CM, as illustrated in Figure 1.In infants fed with formula,stool hemoglobin concentration did not change from baseline and remained significantly (P < 0.01) lower than in infants fed with CM.Again, a large minority (38%) of infants fed with CM reacted to the milk (responders) and accounted for all of the observed increase in mean stool hemoglobin. In the majority of infants (non-responders) stool hemoglobin concentrations were indistinguishable from those of formula-fed control infants. One responder infant in the study of Ziegler et al. 22 had massive blood loss (average iron loss of 2.04 mg/day) and developed iron deficiency anemia after just 1 month on CM. The remaining nine responders lost, on average, 0.24 mg of iron per day, an amount that is not trivial in infants whose ability to gain 0.7 mg of iron per day is already compromised by low iron intake due to being fed CM. It should be noted that intestinal blood loss was clinically silent and that feeding-related behaviors did not differ between responders and non-responders. Also of note is that infants who were fed milk-based formula from birth were less likely (P = 0.059) to respond to CM with intestinal blood loss than infants who were breastfed from birth. Subsequent studies 23,24 answered the question of whether CM-induced intestinal blood loss also occurs in older infants. Infants were fed CM for 2 months starting at 7 ½ months, 9 months, or 12 months of age. About half of the study participants were initially breastfed for various lengths of time, while the other half of infants were fed formula only (including soy-based formula). While being fed with CM beginning at 7 ½ months (224 days) of age, fecal hemoglobin concentrations rose significantly (P < 0.05), but the increase was, on average, less pronounced than at 5 ½ months of age. Among the 26% of infants who were classified as responders, average fecal hemoglobin was 3,010 mg/g dry stool (Figure 2). Among the responders were two infants with persistent high fecal hemoglobin concentrations that averaged 7,430 and 8,156 mg/g dry stool, respectively. When CM was introduced at 9 months (280 days) of age, 29% of infants showed a response and had stool hemoglobin concentrations that were significantly (P < 0.01) higher than at baseline. But when CM was introduced at 12 months of age, it produced no increase in fecal hemoglobin above baseline (Figure 2). Two infants (7%) showed a response, but it was quite mild and short-lived. Of note is that baseline fecal hemoglobin concentrations showed a marked increase with age. They averaged 657 mg/g dry stool at 5 ½ months of age and rose steadily until they reached 1,395 mg/g dry stool at 9 months of age and 1,194 mg/g dry stool at 12 months of age (Figure 2). The increase probably reflects the increasing presence of unabsorbed food heme (for example, from meat) rather than elevated baseline blood loss, but the latter possibility cannot be excluded. S39
4 Figure 2 Summary of results from three studies in which CM was introduced at different ages Open bars represent infants fed with CM who did not respond to CM. Hatched bars represent those responding to CM with increased fecal hemoglobin. Numbers on top of the bars indicate the percentage of responders. Inhibition of iron absorption by components of cow's milk In contradistinction to heme iron, the absorption of nonheme iron, which constitutes the bulk of dietary iron, is subject to inhibition by substances that are common in the diet, including casein and calcium. 25 Casein and calcium are present in CM in much higher concentrations than in human milk. In adult subjects, iron absorption from human milk was found to be 37.3% while it was 15.5% from CM. 26 When the calcium concentration of human milk was raised to the same level as in CM, iron absorption from human milk was only 19.2%. Thus, calcium explained about 70% of the difference in iron bioavailability between human milk and CM. 26 No similar studies have been reported for infants. Hurrell et al. 27 showed that casein and other milk proteins strongly inhibit the absorption of iron. Thus, it is evident that CM, with its high calcium and casein content, is likely to have an adverse impact on the availability of the already modest amounts of iron that infants and toddlers ingest with complementary foods. Iron fortification of cow's milk Being a rich source of protein and minerals, CM plays an important role in the overall nutrition of infants and young children. In some countries the government provides CM to low-income populations free of charge or at subsidized prices. The adverse effect of CM on iron status detracts from the value of CM as a nutritional staple. Fortification of CM with iron offsets the negative effect of CM on iron metabolism. In addition, fortification takes advantage of the widespread use of CM, using it as a vehicle for general iron supplementation as part of efforts to combat ID. Iron fortification of CM is technically feasible and has no effect on the organoleptic properties of the milk. Several studies have documented the effectiveness of iron fortification of CM. In Mexico, a program of distributing iron-fortified CM has been shown to be effective in reducing the prevalence of anemia and ID. 28,29 Chile has had a milk fortification program for several decades and its effectiveness has been documented. 30,31 Similarly, in Indonesia the distribution of iron-fortified milk has led to a reduction in the prevalence of anemia among infants and young children. 32 Although these reports demonstrate that iron fortification of CM is associated with better iron nutritional status than unfortified CM, it remains unclear whether fortification completely offsets the adverse effects of CM. One variable that seems crucial in this regard is the amount of iron added to the milk. Nevertheless, it is established that iron fortification of CM is feasible and has proven efficacy for improving the iron status of infants and children. OTHER ADVERSE EFFECTS OF COW'S MILK Owing to its high protein and electrolyte content, the potential renal solute load of CM is about three times higher than that of human milk. 33 This high renal solute load leads to higher urine osmolar concentration than is S40
5 observed during feeding with breast milk or formula. When fluid intakes are low and/or when extrarenal water losses are high, the renal concentrating ability of infants may be insufficient for maintaining water balance, and dehydration may ensue. There is, indeed, strong epidemiological evidence that consumption of CM places infants at increased risk of serious dehydration. 33 This risk diminishes with advancing age of the infant and is no longer clinically relevant after the first year of life. A high protein intake during infancy, such as that provided by CM, deserves attention because of the possibility that it may have long-term adverse effects. 34 In at least two studies, an association between high protein intake in early life and increased adiposity during childhood has been noted. 35,36 The possibility of such an adverse effect has received experimental support from the European Obesity Project, a large multicenter study comparing a formula with high protein content with a formula with moderate protein content. 37 Infants fed the high-protein formula during the latter part of the first year of life had greater weight at 12 months of age but not greater length, suggesting increased adiposity. The weight difference was still present at 2 years of age. CONCLUSION The feeding of CM to infants and toddlers is strongly associated with diminished iron nutritional status and an increased risk of ID. The negative effects of CM on iron nutritional status are thought to mainly result from the low iron content of CM. CM also causes occult intestinal blood loss in many infants and contains potent inhibitors of iron absorption from the diet. The resulting negative effect on iron status could be overcome by the use of iron-fortified CM or by providing iron supplements. The feeding of unmodified pasteurized CM also places infants at high risk of severe dehydration and may increase the risk of obesity in childhood. Because of these adverse effects, unmodified CM should not be fed to infants and should only be fed to toddlers in modest amounts. Acknowledgments Declaration of interest. The author has no relevant interests to declare. REFERENCES 1. Smith NJ, Hunter RE. Iron requirements during growth. In: Hallberg L, Harwerth H-G, Vannotti A, eds. Iron Deficiency. New York: Academic Press; 1970: Woodruff CW, Wright SW, Wright RP. The role of fresh cow s milk in iron deficiency. 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6 23. Ziegler EE, Jiang T, Romero E, Vinco A, Frantz JA, Nelson SE. Cow s milk and intestinal blood loss in late infancy. J Pediat. 1999;135: Jiang T, Jeter JM, Nelson SE, Ziegler EE. Intestinal blood loss during cow milk feeding in older infants. Quantitative measurements. Arch Pediatr Adolesc Med. 2000;154: Hallberg L. Does calcium interfere with iron absorption? Am J Clin Nutr. 1998;68: Hallberg L, Rossander-Hultén L, Brune M, Gleerup A. Bioavailability in man of iron in human milk and cow s milk in relation to their calcium contents. Pediat Res. 1992;31: Hurrell RF, Lynch SR, Trinidad TP, Dassenko SA, Cook JD. Iron absorption in humans as influenced by bovine milk proteins. Am J Clin Nutr. 1989;49: Villalpando S, Shamah T, Rivera JA, Lara Y, Monterrubio E. Fortifying milk with ferrous gluconate and zinc oxide in a public nutrition program reduced the prevalence of anemia in toddlers. J Nutr. 2006;136: Rivera JA, Shamah T, Villalpando S, Monterrubio E. Effectiveness of a large-scale iron-fortified milk distribution program on anemia and iron deficiency in low-income young children in Mexico. Am J Clin Nutr. 2010;91: Stekel A, Olivares M, Cayazzo M, Chadud P, Llaguno S, Pizarro F. Prevention of iron deficiency by milk fortification. II. A field trial with a full-fat acidified milk. Am J Clin Nutr. 1988;47: Torrejon CS, Castillo-Duran C, Hertrampf ED, Ruz M. Zinc and iron nutrition in Chilean children fed fortified milk provided by the Complementary National Food Program. Nutrition. 2004;20: Semba RD, Moench-Pfanner R, Sun K, et al. Iron-fortifed milk and noodle consumption is associated with lower risk of anemia among children aged 6 59 months in Indonesia. Am J Clin Nutr. 2010;92: Fomon SJ, Ziegler EE. Renal solute load and potential renal solute load in infancy. J Pediatr. 1999;134: Koletzko B, von Kries R, Closa R, et al. Can infant feeding choices modulate later obesity risk? Am J Clin Nutr. 2009; 89(Suppl):S1502 S Rolland-Cachera MF, Deheeger M, Akrout M, Bellisle F. Influence of macronutrients on adiposity development: A follow up study of nutrition and growth from 10 months to 8 years of age. Int J Obes Relat Metab Disord. 1995;19: Günther AL, Buyken AE, Kroke A. Protein intake during the period of complementary feeding and early childhood and the association with body fat at 7 years of age. Am J Clin Nutr. 2007;85: Koletzko B, von Kries R, Closa R, et al. Lower protein in infant formula is associated with lower weight up to age 2 years: A randomized clinical trial. Am J Clin Nutr. 2009;89: S42
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