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 Table of Contents  
ORIGINAL ARTICLE
Year : 2015  |  Volume : 10  |  Issue : 2  |  Page : 76-81

Iron status among obese Egyptian adolescents


1 Department of Medical Studies, Institute of Postgraduate Childhood Studies, Cairo, Egypt
2 Department of Child Health, Medical Division, National Research Centre, Cairo, Egypt
3 Department of Medical Physiology, Medical Division, National Research Centre, Cairo, Egypt

Date of Submission26-Jan-2015
Date of Acceptance20-Sep-2015
Date of Web Publication8-Feb-2016

Correspondence Address:
Manal A Mohsen
Department of Child Health, Medical Division, National Research Centre, El-Bohoth St., Dokki, PO Box 12311, Cairo
Egypt
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/1687-4293.175888

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  Abstract 

Background/aim
Obesity and iron deficiency are the most common nutritional disorders in the world. The aim of this work was to assess the iron status, including serum total iron binding capacity (TIBC), transferrin saturation, serum ferritin and soluble serum transferrin receptor (sTfR), among obese Egyptian adolescents.
Patients and methods
A cross-sectional case-control study was conducted on 80 adolescents aged 12-14 years who attended the Nutritional Clinic of the National Research Centre. They were divided into two equal groups of 40 adolescents each: the obese group and the nonobese group. Thorough clinical examination including anthropometric measurements was performed. Haemoglobin level was assessed using the cyanmethaemoglobin method. Serum iron, TIBC, transferrin saturation, serum ferritin and sTfR were analysed using ELISA.
Results
Obese adolescents revealed significantly lower levels of haemoglobin, serum iron, ferritin and transferrin saturation, and significantly higher diastolic blood pressure and higher TIBC and sTfR, compared with the nonobese group. Obese adolescents had higher frequency of iron deficiency anaemia compared with nonobese adolescents (80 vs. 17.5%).
Conclusion
Weight loss programmes for obese adolescents are essential for correction of iron status. Iron fortification for obese adolescents is recommended.

Keywords: children, iron deficiency, obesity


How to cite this article:
Nazif HK, El Shaheed AA, El-Shamy KA, Mohsen MA, Fadl NN, Moustafa RS. Iron status among obese Egyptian adolescents . J Arab Soc Med Res 2015;10:76-81

How to cite this URL:
Nazif HK, El Shaheed AA, El-Shamy KA, Mohsen MA, Fadl NN, Moustafa RS. Iron status among obese Egyptian adolescents . J Arab Soc Med Res [serial online] 2015 [cited 2020 Aug 8];10:76-81. Available from: http://www.new.asmr.eg.net/text.asp?2015/10/2/76/175888


  Introduction Top


Anaemia is one of the most important nutritional deficiencies affecting various social and socioeconomic strata. It is more common in developing countries, with children and adolescents being at a significantly higher risk for the condition. Recent studies have revealed a prevalence of iron deficiency anaemia (IDA) of around 20% in adolescents [1] .

Nutrition during childhood has a significant impact on lifelong health. Obesity and iron deficiency (ID) are two of the most common nutritional disorders worldwide [2] . The prevalence of childhood overweight and obesity is increasing, with the worldwide prevalence having doubled or tripled in industrialized countries over the past few decades [3] . ID continues to be the most prevalent single micronutrient deficiency-related disease in the world, affecting billions of people [4] . Data from NHANES III were examined for an association between ID and weight [5] . The prevalence of ID increased as BMI increased from normal weight to more than the 85th percentile for age and sex to more than the 95th percentile for age and sex (2.1, 5.3 and 5.5%, respectively). Obesity was a risk factor for IDA in both boys and girls, but rates were approximately three times higher in girls [5] . However, whether being overweight or obese is associated with increased risk for anaemia or IDA is still being debated [6] .

Adolescence is a time of increased iron needs because of the expansion of blood volume and increases in muscle mass. The incidence of ID among adolescents appears to be rising [7] . The aetiology of anaemia in obese individuals is uncertain but may be related to low-quality diets or increased needs relative to body weight [5],[8] . A number of factors have been typically proposed to explain the association between ID and obesity. Eating unbalanced meals - for example, low-cost fast food that is particularly rich in carbohydrates and fat but contains a low quantity of essential nutrients such as iron - has been claimed as the most important cause for this association [7] . Radically changing this sound point of view, a recent study investigating the intake of heme and nonheme iron in a convenience sample of more than 200 obese patients showed that differences in iron intake, or of dietary factors known to affect iron absorption, were not associated with the lower serum iron concentrations found in obese patients. Additional studies investigating other factors that may be associated with the hypoferremia of obesity are warranted [9] .

The present work aimed to determine the iron status, including determination of serum levels of total iron binding capacity (TIBC), transferrin saturation, serum ferritin and soluble serum transferrin receptor (sTfR), in obese Egyptian adolescents and explore the link between iron status and obesity, as both have significant public health implications.


  Patients and methods Top


A cross-sectional case-control study was conducted on 80 adolescents aged 12-14 years. They were divided into two equal groups of 40 each. Forty obese adolescents (21 girls and 19 boys), selected randomly from obese cases who attended the nutritional clinic at the National Research Centre, constituted the first group. The second group comprised sex-matched and age-matched lean adolescents who consulted the Paediatric Clinic in the National Research Centre for minor complaints. They were considered as the control group. None of the adolescents in the study population were taking any medication or had clinical evidence of endocrine or metabolic disease. Adolescents with chronic conditions or with organic causes of obesity, who were on iron supplements, or were taking medications that could affect body weight, and girls with menorrhagia were excluded from this study. Their socioeconomic level was above average. This study was conducted over a period of 12 months starting from January 2011 to December 2011.

Written informed consent was obtained after explanation of the aim of the study. The study was approved by the Medical Ethics Committee of the National Research Centre.

Children were subjected to thorough clinical examination, including anthropometric measurements. Height was measured to the nearest 0.1 cm using a Tanita Stadiometer (USA), and weight was determined to the nearest 0.01 kg using a Tanita Digital Balancer, with the patient dressed in minimum clothes and wearing no shoes. BMI was calculated as weight (in kg) divided by height squared (in m) (kg/m 2 ). BMI exceeding the 95th percentile was used for obesity diagnosis. Control adolescents had BMI below the 85th percentile, based on the Egyptian Growth Charts [10] . The waist and hip circumferences were measured, and the waist/hip ratio was calculated. The landmarks, instruments and techniques used followed the WHO standardized anthropometric methods [11] .

After resting for 5 min, blood pressure (BP) was measured in the sitting position using an appropriately sized cuff on both arms [12] . The systolic blood pressure (SBP) and diastolic blood pressure (DBP) used in the analysis were derived from the mean BP measured on both arms.

Blood samples were obtained aseptically using vein puncture. A volume of 5 ml venous blood was drawn from each adolescent after an overnight fast (8 h) and was divided into two parts. The first part was whole blood collected in plastic tubes with, which served as anticoagulant for haemoglobin assay. Samples for haemoglobin evaluation were subjected to immediate assay. The second part was collected in plain, clean plastic tubes without additives for serum iron, TIBC, serum ferritin and sTfR assessment. It was kept at room temperature for 2 h, allowed to clot, and then centrifuged; the serum was separated and kept in plastic Eppendorf tubes and frozen at -20°C until the time of assay.

Haemoglobin level was assessed using the cyanmethaemoglobin method for the in-vitro determination of haemoglobin in whole blood with heparin or ethylene-diamine-tetra-acetic acid. It was applied according to the International Committee for Standardization in Haematology [13] . Serum iron and TIBC were assessed using the quantitative colorimetric determination of iron, and the unsaturated iron binding capacity in serum was assessed using Stanbio Laboratory Kits (Texas, USA) according to Burtis and Edward [14] . The reference value for serum iron for boys in this age group is 60-120 μg/dl and that for girls is 50-120 μg/dl, whereas the reference value for TIBC for this age group is 250-400 μg/dl according to Behrman et al. [15] . Circulating ferritin concentration in serum was quantitatively determined by means of a microplate immunoenzymometric assay (ELISA) using Monobind Inc. kits (Lake Forest, CA, USA), as done by Burtis [16] . The reference value for this age group of children is less than 10 ng/ml, as per Fairbanks and Klee [17] . sTfR is an indicator of iron status that is unaffected by the acute-phase response [18] . It was assessed using the quantitative measurement of human sTfR in serum using ELISA kits of BioVendor Research and Diagnostic products. The reference value for this age group of children is 0.9-3.3 μg/dl [18],[19] .

Iron status has been assessed by measuring serum iron [14] , transferrin and ferritin concentrations [16] . Transferrin saturation was calculated by finding the molar ratio of serum iron and twice the serum transferrin (because each transferrin molecule can bind two atoms of iron) using the following formula: transferrin saturation = [serum iron (μg/dl)/transferrin (mg/dl)] ×71.2 [20] . Anaemia was considered according to WHO standards as haemoglobin less than 11.5 g/dl and severe anaemia as less than 7.0 g/dl [21] .

IDA was defined as concurrent ID and anaemia. The laboratory criteria used in this work to diagnose ID were as follows: Serum iron < 60 µg/dl in boys and < 50 µg/dl in girls were assigned as ID [15] . Serum ferritin <10 ng/ml [17] and serum transferrin saturation less than or equal to 15 (Transferrin Saturation (TS) = serum iron/TIBC ×100) [22] were also diagnosed as ID. ID was defined as the presence of at least two abnormal age-corrected iron parameters.

Data analysis was performed using SPSS (version 16; SPSS Inc., Chicago, Illinois, USA). Simple statistics and bivariate analysis were used. For comparing two means, Student's t-test of significance was utilized. The χ2 -test of significance was used to compare the frequency between two categorical variables. P-values less than 0.05 were considered statistically significant.


  Results Top


The results of obese adolescents showed highly significant increases (P<0.01) in weight, BMI, waist circumference (WC), hip circumference and waist to hip ratio when compared with the control group. DBP was significantly higher (P<0.01) in obese adolescents than in the control group, whereas nonsignificant changes were reported in SBP between the two groups, as shown in [Table 1].
Table 1 Anthropometric and blood pressure measurements of the obese Egyptian adolescents under study

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The present results showed that symptoms and signs of anaemia were prominent in obese adolescents: there were increases in the frequency of tachypnea, easy fatigability and lack of concentration in obese adolescents compared with the control group, as well as increases in the frequency of rate of pallor and nail changes [Table 2].
Table 2 Symptoms and signs of anaemia in the obese Egyptian adolescents under study

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The present results found that the studied obese adolescents had highly significantly reduced (P < 0.01) haemoglobin content, serum iron, ferritin and transferrin saturation levels, and highly significant increases in TIBC and sTfR levels, compared with the control group [Table 3].
Table 3 Haemoglobin and iron status results of the obese Egyptian adolescents under study

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Results also showed that the frequency of IDA (serum iron for boys <60 μg/dl, for girls <50 μg/dl, transferrin saturation ≤15% and haemoglobin concentration <11.5 g/dl) was significantly greater (P < 0.01) in obese adolescents than in the control group, as shown in [Figure 1].
Figure 1: Comparison between the obese adolescents group and the control group as regards the frequency of iron defi ciency anaemia

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  Discussion Top


IDA is the main micronutrient deficiency that may affect adolescents. It is one of the most universally prevalent diseases in the world today particularly in developing countries, and it is a major public health problem. ID has been considered an important risk factor for ill health and is estimated to affect two billion people worldwide [23] . The consequences of IDA include diminished cognitive function and exercise performance [24] .

ID is the most common nutritional deficiency in the USA and has been linked to obesity in adults and children from both industrialized and transition countries [25] . Speculation of the aetiology of obesity-associated ID has included inadequate dietary iron intake, increased iron requirements due to increased body size and blood volume, and menstrual irregularities [26] .

ID and abnormal BMI are two nutritional disorders worldwide, particularly in developing countries [27] . During adolescence, 20% of final adult height and 50% of adult weight are achieved. Because of this rapid growth, adolescents are especially vulnerable to anaemia [28] . The maximum physical, psychological and behavioural changes take place during these years of life, and it has been found that less than 2% of teenagers eat sufficient essential foods and nearly 20% of girls and 7% of boys do not consume adequate amounts of even one of the food groups [28] . Frequently dieting or constrained eating, missing meals, vegetarian eating styles, high carbohydrate meals, and fast foods are all risk factors for anaemia in adolescents. Despite bigger iron needs, many adolescents, especially girls, do not take enough iron from their diets. Seventy five percent of teenage girls do not consume an adequate diet, especially those containing iron, and do not meet their dietary requirements for compensation of iron loss from menstruation, compared with only 17% of teenage boys. Therefore, teenagers are prone to ID and IDA. ID during adolescence causes mental and cognition disturbances, fatigue and lower work capacity [29],[30] . It is expected that about 11% of female adolescents are iron deficient in the USA [31] .

In this study, confirming the link between adiposity and serum iron levels, obesity was associated with poor iron status. Recent studies have ruled out inadequate dietary iron intake as the source of this problem [9] . Latest research has focused on the impact of obesity-associated low-grade inflammation on systemic iron metabolism [32] . Results of the present study showed a highly statistically significant increased weight, BMI, WC, hip circumference and waist to hip ratio in obese adolescents when compared with the control group. This is in agreement with Salem et al. [33] , who reported a highly significant difference between obese and control children as regards BMI, WC, hip circumference and waist to hip ratio in both boys and girls.

Among the factors that can interfere with BP, the literature shows that White children have a greater chance of having higher BP compared with non-White children, as they tend to have a higher fat percentage. Excess fat plays a role in the blood hypertension pathogenesis, either directly associated with the metabolic characteristics of adipocytes located mainly in the abdominal region or indirectly by means of hyperinsulinaemia resulting from the insulin resistance and consequent disorder in glucose metabolism [34] .

The variation in body fat distribution is an important morphological indicator related to endocrine and metabolic complications, which predispose to the development of cardiovascular diseases. Individuals with centripetal disposition of body fat tend to have a higher incidence of blood hypertension. Increased WC has been related to higher BP levels. A cross-sectional study with obese and eutrophic children aged 7-12 years found that individuals with increased WC were 2.8 times more likely to have high BP compared with those with adequate WC [35] .

In this study, the prevalence of hypertension increases progressively with increasing BMI, and studies have detected hypertension in over 30% of obese children [36] .

Blood hypertension, although treatable and easily measurable and assessable clinically, is a silent disease, whose degenerative and cumulative effect is greater among younger individuals because of their longer exposure. Excess weight causes abnormalities in BP and therefore predisposes to cardiovascular diseases. Many of the abnormalities that occur in this age group are reversible if there is early detection and intervention to combat the risk factors for cardiovascular diseases, as the process of atherosclerosis and left ventricular hypertrophy may be reversed or minimized by reducing weight [35] .

The adverse impact of excess weight on the multiple cardiovascular risk factors, such as high BP, requires primary prevention at early ages, as studies indicate that excess weight in childhood and adolescence tends to persist into adulthood. Thus, the prevalence of high BP identified in the study population, especially among adolescents with severe obesity, strengthens the importance of preventing obesity and its comorbidities [35] .

These results showed that the frequency of IDA(serum iron in boys <60 μg/dl, that in girls <50 μ/dl, transferrin saturation ≤15% and haemoglobin concentration <11.5 g/dl) was greater in obese adolescents than in the control group [(32 (80%) vs. 7 (17.5%)]. These results go hand in hand with those of Manios et al. [37] , who reported a high prevalence of ID and IDA in obese children and adolescents of both sexes.

Previous reports have proposed different mechanisms to explain the high rate of ID among obese children, including consumption of high calorie, iron-poor diets, sedentary lifestyle resulting in decreased myoglobin breakdown, and increased iron requirements for increased red cell mass. A potential mechanism explaining the impact of obesity on iron status may involve the increased production of the protein hepcidin. Hepcidin is a key regulator of iron homeostasis, decreasing intestinal iron absorption and promoting iron sequestration in macrophages, effectively lowering serum iron and the bioavailability of iron [35] .


  Conclusion and recommendations Top


In this study a high frequency of IDA was observed among the studied obese adolescents in Egypt, the magnitude of which warrants the need for multiple, large studies in different Egyptian districts.

Regular screening for IDA in obese adolescents is fundamental.

Weight loss programmes may be essential for correction of iron status. Iron fortification for obese adolescents is recommendable.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

 
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