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We evaluated the effects of hospital stay on nutritional anthropometric data in children of various age groups and investigated the effects of admission undernutrition on nutritional anthropometric data in children who were hospitalized in our university hospital in Turkey. The adverse effect of hospitalization on nutritional status was shown to be most obvious on the 2-6-year age group with undernourished children. We also found reduced anthropometric parameters in all patients with mild malnutrition at admission (p < 0.05). A significant number of pediatric patients in Turkey are at nutritional risk at the time of hospital admission (31.8 per cent). The well-nourished children do not carry nutritional risk due to hospitalization for other medical reasons. Since undernutrition has an adverse effect on morbidity and mortality, careful nutritional evaluation of children on admission is essential. Special attention should be given to patients who had mild malnutrition on admission since this population of patients seem to be at higher risk of adverse effect of hospitalization.

There are conflicting reports regarding the association of Helicobacter pylori (H. pylori) infection with growth failure. We evaluated the role of H. pylori infection on malnutrition and growth failure in dyspeptic children. The study cases included 108 dyspeptic children and were evaluated by endoscopic gastric biopsy, while 50 healthy children constituted the control group. The study cases were grouped as H. pylori [+] (n = 57) and H. pylori [-] (n = 51) by the presence or absence of microorganism in gastric tissue, respectively. Age, gender, height for age (H/A), weight for height (W/H), body mass index (BMI), weight and height z scores and the daily calorie intake of the children were recorded. Malnutrition and growth failure were evaluated by the Waterlow criteria and height z score, respectively. Then, the H. pylori [+], H. pylori [-] and control groups were compared in relation to the variables defined above. All groups were similar with respect to gender and age. The daily calorie intake was lower in dyspeptic children. Although anthropometric variables were similar in the H. pylori [+] and [-] groups, the control cases had higher W/H compared to both H. pylori [+] (p = 0.030) and H. pylori [-] (p = 0.000) cases, and higher BMI (p = 0.001) and weight z scores (p = 0.014) than those in the H. pylori [-] group. The malnutrition rate was similar in the H. pylori [+] and [-] groups. However, mild acute (p = 0.033) and general malnutrition rates (p = 0.000) were lower in the control cases compared to the study cases. The short stature rate was not different significantly in all three groups. In conclusion, the results of this study do not support the data that H. pylori infection plays an extra role in malnutrition and growth failure in children presenting with dyspeptic complaints. However, as a major cause of dyspepsia, H. pylori infection might be considered to cause malnutrition secondary to decreased calorie intake associated with dyspepsia.

Sequential therapy seems highly effective for eradicating H pylori in children; however, the difference between 2 groups in resistant strains was the limitation of the study. Our country needs to reassess the effectiveness of standard triple therapy regimen for H pylori eradication.

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In addition to BMI, percentage of standard weight for height is a valuable nutritional anthropometric parameter for serum leptin concentrations in PEM and inadequate energy intake. However in the present study, percentage of standard BMI was the best predictor for serum leptin concentrations. Serum leptin concentrations are low not only in severe PEM, but also in children with mild-to-moderate PEM without chronic disease.

During recovery from malnutrition, leptin concentrations increase in relation to fat mass if the fat mass reaches a critical point, and leptin might trigger catch-up growth with its regulator effects on growth. Although weight gain was noted in both groups, an increase in leptin concentration was observed only in children who showed catch-up growth. More interestingly, the mean leptin concentration was much higher in children with PEM who had catch-up growth compared to the control group and in children who failed to have catch-up growth. In children with catch-up growth, the higher serum leptin concentrations compared to healthy children and to children without catch-up growth despite significant weight gain suggests that leptin affects nutritional status in catch-up growth as a dynamic process, rather than merely being an index of body fat content.