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versão impressa ISSN 0037-8682versão On-line ISSN 1678-9849
Rev. Soc. Bras. Med. Trop. vol.42 no.5 Uberaba set./out. 2009
O índice de massa corporal aumentado é associado a risco de leishmaniose cutânea?
Daniel Ferreira da Cunha; Selma Freire de Carvalho da Cunha; Adriana Guimarães Nunes; Mário León Silva-Vergara
Departament of Clinical Medicine, Federal University of Triangulo Mineiro, Uberaba, MG, Brazil
All adults (n = 334) living in Brejo do Mutambal, an endemic area for cutaneous leishmaniasis, were included in this study. Contrary to our initial hypothesis, it was observed that men (23.7 ± 3.2 vs. 22.1 ± 2.6 kg/m2) and women (24.1 ± 4.7 vs. 22.5 ± 3.4 kg/m2) with cutaneous leishmaniasis presented higher body mass index than the controls.
Key-words: Cutaneous leishmaniasis. Nutritional status. Overweight. Obesity.
Neste estudo, foram incluídos todos (nº =334) os adultos morando em Brejo do Mutambal, região endêmica para leishmaniose cutânea. Contrário à hipótese inicial, observou-se que homens (23,7 ± 3,2 vs. 22,1 ± 2,6kg/m2) e mulheres (24,1±4,7 vs. 22,5±3,4kg/m2) com leishmaniose cutânea apresentaram maior índice de massa corporal que os controles.
Palavras-chaves: Leishmaniose cutânea. Estado nutricional. Sobrepeso. Obesidade.
Malnourished children are at increased risk of parasitic infections, including visceral2 and cutaneous leishmaniasis9. Furthermore, immune activation of parasitized macrophages in the mononuclear phagocyte system is associated with severe malnutrition, characterized by anemia, hypoalbuminemia and fat and muscle wasting1 2 4 9. In addition, children with recurrent or chronic infections of the dermis or the respiratory or gastrointestinal tracts may exhibit somatic growth failure, which is thought to be caused by subclinical, low-level stimulation of their immune system, with the catabolic consequences of the acute-phase response12.
Although some studies have already described the nutritional status of children with Leishmania infection1 2 12, no reference was found in the literature regarding the nutritional status of adults with cutaneous leishmaniasis (CL). Since body mass index (BMI, weight divided by the square of the height) has been used to describe the nutritional status of adults in clinical and epidemiological studies5, the aim of this study was to investigate whether adults with CL would have lower body mass index than a control group of individuals without CL.
SUBJECTS AND METHODS
This cross-sectional study was carried out in a village called Brejo do Mutambal, which is located in the semiarid rural zone of the municipality of Varzelândia, in the northeast of the state of Minas Gerais, Brazil, an endemic area for cutaneous and mucosal leishmaniasis. The village is closely surrounded by rocky hills of about 10-12 meters high, and has about 700 inhabitants living in adobe houses, with electricity but only rarely with adequate sanitation and water supply. The Research Ethics Committee of the Medical School of the Triângulo Mineiro University, Uberaba, Brazil, approved the study. Informed consent was obtained from all participants.
All adults (age > 18 years; n = 334) living in the village were included. Anthropometry was carried out, consisting of height measurements, without shoes, to the nearest 0.1cm using a non-extensible tape, and weight measurements while wearing light clothes and without shoes, to the nearest 0.1kg using portable scales. Body mass index (BMI) was defined as the weight in kilograms divided by the square of the height in meters (kg/m2), and the following criteria were used5: underweight (BMI < 18.5kg/m2), normal (BMI within the range of 18.5-25kg/m2), and overweight/obese (BMI > 25kg/m2). Cutaneous leishmaniasis (CL) was defined by the presence of an active (< 5% of cases) or healed, atrophic and depigmented ulcer diagnosed by a dermatologist, plus a positive Montenegro test. The latter is a delayed cutaneous hypersensitivity test with sensitivity of 86 to 100%, and specificity of 100%6. All numerical variables were expressed as mean ± standard deviation. Differences between the CL and control groups were compared by means of the non-paired "t" test. Chi-square or Fisher's exact tests were performed to compare frequencies. Probabilities less than 0.05 were considered significant.
Cutaneous leishmaniasis was diagnosed in 86 (25.7%) cases: 54.7% (47) in men and 45.3% (39) in women. There was predominance (71%) of nonwhite individuals (black, brown or mulatto skin color), without any statistical difference between the CL and control groups. Age, height, weight and BMI, along with percentage malnutrition and overweight and obesity among the CL and control groups are shown in the Table 1. Overweight/obesity occurred in 38 cases (11.4% of the total), with higher frequency among women than among men (15 vs. 7.8%; χ2 = 4.28, p < 0.05). Among women, obesity was more common in CL cases than in controls (25.6 vs. 11.7%, χ2 = 4.55, p < 0.05); the odds ratio for CL among obese women was 2.60 (95% confidence interval, 0.96-6.95). Overweight/obesity was also statistically more common among men with cutaneous leishmaniasis (14.9 vs. 5%); the odds ratio for CL among overweight/obese men was 3.33, with 95% confidence interval of 0.93-12.02.
The causes of these frequencies of BMI and overweight/obesity among individuals with CL are unclear. Regular topographical conditions such as the rocky hills surrounding the village of Brejo do Mutambal, and high and similar frequencies of CL among men and women suggest that peridomestic transmission of the Leishmania infection was occurring. In this setting, greater exposure of overweight/obese individuals to sandfly bites is not an acceptable explanation. Rather, a preference among sandflies for biting weightier or obese individuals, as seen with exposure to malarial mosquitoes during pregnancy8, is a plausible hypothesis that should be tested by further investigation. Obese individuals often have high serum leptin levels, with or without insulin resistance10. Since leptin also regulates the balance of T helper cytokines (Th1/Th2), and the production of several pro and anti-inflammatory cytokines3, further studies investigating possible interactions between leptin and cytokines should be conducted among obese patients with cutaneous leishmaniasis.
The limitations of this study include lack of information about current host food intake and immune response details to Leishmania infection, as well as lack of information about the activity of the disease at the time of this study. Nonetheless, because undernutrition and overnutrition are the two endpoints of the malnutrition spectrum, these obese individuals may have had impaired immunity associated with the consumption of imbalanced diets7. Moreover, because spontaneous healing of cutaneous ulcers may occur in healthier individuals, it cannot be ruled out that obese individuals with better general health may have presented a better immune response7. In addition to studies confirming our findings in other regions, the present study also demands clinical and laboratory research, including in relation to the Th1 and Th2 responses of obese individuals challenged with Leishmania species.
To FAPEMIG, CNPq, and the Teaching and Research Foundation of Uberaba (FUNEPU).
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Prof. Daniel Ferreira da Cunha
Discipline of Nutrology
Departament of Clinical Medicine/UFTM
Av. Getúlio Guaritá 130
38025-440 Uberaba, MG, Brazil
Telefax: 55 34 3318-5335
Received in 09/12/2008
Accepted in 21/08/2009
Financial support: Fapemig, CNPq, Research foundation of Uberaba (FUNEPU)