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Artykuł oryginalny

Frequency of overweight/obesity among a group of children with celiac disease in Iran

Touran Shahraki, Mansour Shahraki, Ivor D. Hill

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Introduction

Celiac disease (CD) is an autoimmune enteropathy characterized by small intestinal villous atrophy induced by gluten ingestion and requires lifelong treatment with a gluten-free diet [1]. The availability of serological screening tests has enhanced awareness of the condition and revealed that about 1% of the general population is affected by CD [2]. Children may present with the classical picture of disease characterized by chronic diarrhea, failure to thrive (FTT) and abdominal distention or with non-classical features including gastrointestinal symptoms as well as extra-intestinal manifestations. Additional asymptomatic cases have been identified on the basis of screening people who are at increased risk for the condition [3].
Because CD causes damage to the small intestinal mucosa it can be expected to result in malabsorption of nutrients leading to poor weight gain, weight loss and undernutrition. However, a number of recent reports have identified an increasing number of adults, adolescents and children who are overweight, or even obese, at the time of initial diagnosis of CD [4–6]. This trend coincides with the rising prevalence of overweight and obese people in the general population in many developed countries as well as in Iran [7, 8].

Aim

There are no studies describing the coexistence of CD and overweight/obesity in Iranian children. The primary aim of this study was to determine the frequency of obesity/overweight in children with CD at the initial diagnosis and describe the clinical and pathological characteristics of this group. A secondary aim was to report the relative frequency of normal BMI and under-nutrition in children with CD in south-east Iran.

Material and methods

Medical records of all children with CD seen in a tertiary-care teaching hospital by a pediatric gastroenterologist in south-east Iran over a 9-year period from 2007 to 2015 were reviewed. All subjects less than 18 years old and with biopsy-proven diagnosis of CD were enrolled in the study. Data collected from the medical records included demographic characteristics, anthropometric data, and clinical features at diagnosis, celiac antibody titers and severity of small-bowel mucosal damage. Children with incomplete data were excluded from the study.
Weight, height and body mass index (BMI) of children were calculated based on age and gender percentiles from growth charts published by the Centers for Disease Control and Prevention [9]. For subjects < 2 years, weight-for-height percentiles were used instead of BMI. Children with a BMI for age < 5th percentile were considered underweight, those with a BMI between the 5th and 85th percentile for age were considered normal weight, and those with a BMI between the 85th and 95th percentile for age and > 95th percentile for age were classified as overweight and obese, respectively [10].
TTG IgA and total IgA were determined by a commercial ELISA kit (Aeskulisa, Germany) and Bionik-immunoturbidimetric Assay, Tehran (Iran), respectively. TTG IgA titers of < 12 U/ml were regarded as negative, 12–18 U/ml as borderline and > 18U/ml as positive. In cases with IgA deficiency a serological test for TTG-IgG was requested. All patients had small intestinal mucosal biopsies for evaluation of the grade of villous damage using the modified Marsh grading [11]. Diagnosis of CD was considered confirmed by compatible serologic tests, characteristic small bowel intestinal histology and response to a gluten-free diet according to the ESPGHAN criteria [12]. Those with Marsh II or III changes were diagnosed with CD [1].
All participants had written informed consent from their parents or guardian. The study was approved by the Ethics Committee of the Zahedan Medical University of Sciences and Research Center for Children and Adolescent Health.

Statistical analysis

Data were analyzed by descriptive analysis using SPSS 18 (Chicago, SPSS Inc). The results are presented as mean  standard deviation and proportion. At first normality of data was checked by the Shapiro-Wilk test. The 2 test, one-way ANOVA test and Kruskal-Wallis test were used for comparison between groups. The 2 test was used for comparison of gender and Marsh classification with BMI to compare categorical data. The ANOVA test was used to assess the relation between age and TTG titer with BMI. P-values < 0.05 are considered statistically significant.

Results

Of the 225 children with CD, 121 (54%) presented with a normal BMI, 96 (43%) were underweight and only 8 (3.5%) were overweight/obese at the time of diagnosis. The mean ± SD for age was 7.4 ±3.8 and 139 (62%) were female. A predominance of females to males was found in all three weight categories although this did not reach statistical significance. Seventy-five (33%) subjects were 0–5 years of age, 111 (49%) were 6–11 years old and 39 (17%) were adolescents (12–18 years). The mean age of the underweight and normal weight children was higher than that of obese and overweight children (7.9 ±3.8 and 7.1 ±3.8 vs. 5.7 ±2.6, Table I) but the difference between groups was not significant. There was a significant difference between BMI profile and TTG titer as the mean ± SD TTG titer was higher in overweight/obese and normal weight children compared to underweight subjects. The majority of patients (195/225) had severe enteropathy compatible with Marsh III on duodenal biopsy and the remaining cases (30/225) had Marsh II. There was no association between severity of histological disease (classified by Marsh score) and BMI for age (Table I). Most of the children had gastrointestinal and extra-intestinal manifestations on presentation. A small number of children were asymptomatic.
Of those with overweight/obesity (8 cases), 6 were female, 4 were overweight and 4 were obese. All of the children in this group had > 4 times the upper limit of TTG IgA. All of the children had biopsy results compatible with Marsh III (5 cases had Marsh 3a, 1 case had 3b and 2 subjects had Marsh 3c). The majority of the overweight/obese children belonged to groups at high risk for CD (5 cases) and 3 cases were checked due to their symptoms (Table II). The GI and extra-GI manifestations in the overweight/obese children are shown in Table II. Two children had no symptoms; one was a sibling of a child with CD and the other had diabetes type 1.

Discussion

Coexistence of obesity and celiac disease in children has been reported recently. Although we identified some overweight/obese children with CD in Iran, this number was relatively small and the majority were either of normal weight or underweight.
The relatively high frequency of underweight children with CD in Iran is similar to that found in other developing countries such as India and Turkey [13, 14]. This is in contrast to many developed countries, where the prevalence of undernutrition in children with CD has decreased to 4–5% [15, 16], indicating that malnutrition is no longer a common presentation [17, 18]. As demonstrated in Table III, there are now many reports showing that more than 50% of newly diagnosed children with CD have a normal BMI [13, 14, 16, 19–21]. In a study of 143 American children aged 13 months to 19 years, 74.5% had a normal BMI, which is similar to that of children in Sweden, where 72.8% had normal weight [16, 19]. Therefore, normal body weight in children with CD is a common finding and the BMI is not a reliable indicator for predicting CD in children [16].
In our study the underweight children were generally older at the time of diagnosis than those of normal or excess weight, suggesting perhaps that delay in diagnosis may be associated with poor weight gain or weight loss. It is also likely that the poor growth of the children in this study could be due to poor socioeconomic circumstances in the region [22, 23]. Regardless of the cause, early detection of CD by means of liberal use of serological tests is essential in order to minimize the potential for adverse effects of CD on the nutritional status in children.
There are several reports noting the presence of obesity at the time of diagnosis of CD. In adults the prevalence of overweight/obesity has ranged from 0.45% to 39% while in children it has ranged from 5% to 21% [5, 24–26]. In our population the prevalence of children who were overweight/obese at the time of the initial diagnosis was lower than reported elsewhere and was only 3.4% [24]. Given that CD is a disorder that causes damage to the intestinal mucosa, one would not expect the condition to be associated with excess weight gain.
The reason for obesity in children with CD despite the potential for malabsorption is not clear. Possible explanations include compensatory absorption of nutrients in the distal small bowel due to villous hypertrophy [24], increasing prevalence of obesity in the general population with an effect on the prevalence of other diseases [27], or a deficiency of iron and micronutrients in patients with CD, which might cause an increase in food craving [28]. Regardless of the cause, it is essential that physicians appreciate the fact that overweight/obese children can have CD, as failure to do so could lead to diagnostic delays with potential for adverse health consequences.
Although the overweight/obese children in this series were slightly younger at diagnosis than those with normal or low weight, this difference was not significant, and there was also no difference between the groups with regards to gender or histological grading. The majority of the overweight/obese children were females (6/8), which differs from some studies that report a predominance of boys with CD who are overweight. An interesting observation is that the children in the overweight/obese group had significantly higher levels of TTG-IgA antibodies than the other two groups. The reasons for this finding are unclear.
There are studies that have shown lower antibody titers in patients with failure to gain weight and higher antibody titers in diabetic patients [29], but to the best of our knowledge higher levels in overweight/obese children with CD have not been described before.
One other finding in our study was the association of CD with other autoimmune diseases such as diabetes type 1, which highlights the need for screening as well as correction of nutritional requirements for this population [30, 31].
Our study has some limitations. Because it was a retrospective study from a tertiary referral center in the south-east of Iran, it may not be reflective of other provinces in Iran. In addition, the low numbers of children with overweight/obesity in this study mask any significant clinical characteristics that distinguish these children from those who are normal or underweight. Nevertheless, this is the first study reporting the prevalence of overweight/obesity in Iranian children and serves to alert physicians to consider a diagnosis of CD in symptomatic children regardless of their nutritional status at the time of presentation.

Conclusions

This study highlights the importance of considering a diagnosis of CD in children with symptoms associated with the condition even when they are overweight/obese. Failure to do so can lead to unnecessary diagnostic delays and place children at risk for long-term adverse health consequences.

Acknowledgments

We thank all participants of this study.

Conflict of interest

The authors declare no conflict of interest.

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Received: 18.08.2017
Accepted: 10.11.2017
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