J Endocrinol Metab
Journal of Endocrinology and Metabolism, ISSN 1923-2861 print, 1923-287X online, Open Access
Article copyright, the authors; Journal compilation copyright, J Endocrinol Metab and Elmer Press Inc
Journal website http://www.jofem.org

Original Article

Volume 8, Number 4, August 2018, pages 69-75


Clinical Aspects of Central Obesity at a Public Clinic

Izabela Ferraza, b, e, Izabela Geliskc, Manuela Limad, Maria de Lourdes Silvab, Ana Marice Ladeiab, Armenio Costa Guimaraesb

aHuman Medicine and Health, Medicine and Human Health by the Bahian School of Medicine and Public Health (EBMSP), Bahia, Brazil
bMultidisciplinary Teaching Clinic for Overweight/Obese Patients (PEPE PROJECT) at EBMSP, Bahia, Brazil
cNutrition and Health, Federal University of Bahia (UFBA), Salvador, Brazil
dMedicine and Human Health by the Bahian School of Medicine and Public Health (EBMSP), Bahia, Brazil
eCorresponding Author: Izabela Ferraz, Multidisciplinary Teaching Clinic for Overweight/Obese Patients at EBMSP (Escola Bahiana de Medicina e Saude Publica), Av. Dom Joao VI, 274, Brotas, Salvador, Brazil

Manuscript submitted June 2, 2018, accepted June 13, 2018
Short title: Clinical Aspects of Central Obesity
doi: https://doi.org/10.14740/jem516w

Abstract▴Top 

Background: The relation between central obesity epidemic and food consumption strategies has drawn attention towards understanding its complexity. The aim of our study is to evaluate clinical and nutritional aspects of women with central obesity in Salvador, Bahia.

Methods: The study was done in 89 adult women with waist circumference > 84 cm after individualized outpatient consultations for 48 months (2012 - 2015). Direct interviews were performed with the application of three R24h recalls to evaluation of food consumption in relation to macronutrients, fiber and energy. The biochemical variables were determined in the blood collected with a 12-h fasting period.

Results: There was a significant reduction in the waistline circumference baseline and final values, associated to a reduction in body fat percentage and a significant increase in body water. A significant reduction was observed in the consumption of carbohydrates in parallel to an increase in the consumption of fibers and 55 times in the percentage of consumption of lipids, in addition to a significant reduction in the baseline and final values of glycosylated hemoglobin, fasting glycemia and low-density lipoprotein cholesterol (LDL-C).

Conclusions: It was observed that outpatient care with emphasis in the quality of the diet was capable of reducing anthropometric and clinical variables attributed to the development of illnesses associated with central obesity.

Keywords: Women; Central obesity; Low income; Dietary intake; Food consumption

Introduction▴Top 

Central obesity is characterized by the increase in waist circumference (WC) due to the accumulation of body fat in the abdomen and is associated to increased risk towards the development of hypertension, dyslipidemia and diabetes, causing an increase in the risk of morbidity and mortality from metabolic and cardiovascular diseases [1]. Considering the epidemic of central obesity in the low income Brazilian population, knowledge in relation to the quantity and mainly to the quality of the food consumed is necessary for an adequate nutritional approach [2].

At present, countless discussions address dietary issues and their relation as health indicators, raising the interest of understanding the magnitude of the problem, mainly in the northeastern region of Brazil, where a high prevalence is presented for low income women, which is apparently a paradoxical fact [3].

In view of the relevance of the issue and given the lack of information in the city of Salvador, the objective of this paper is to evaluate the clinical and nutritional aspects of women with central obesity treated at an Outpatient Teaching Clinic for Obese Patients at Escola Bahiana de Medicina e Saude Publica, in Salvador, Bahia.

Materials and Methods▴Top 

This is a prospective clinical trial of obese women, treated at an Outpatient Teaching Clinic at Escola Bahiana de Medicina e Saude Publica, EBMSP, as part of the research project on People with Excess Weight (PEPE), which is an interdisciplinary, multiprofessional project for the healthcare of patients attended by the National Health Service (SUS).

All of the participants selected for the present study had individual attendance, as outpatients, for 48 months (2012 - 2015). The sample was made up of women from low socioeconomic classes C, D and E, classified in accordance with family income class E (up to 2 minimum wages), class D (2 to 4 minimum wages) and class C (4 to 10 minimum wages), in line with the classification criteria of the Instituto Brasileiro de Geografia e Estatistica (IBGE) [4] (Brazilian Institute of Geography and Statistics), and who attended the quarterly consultations, with ages above 18 years, body mass index (BMI) > 25 kg/m2 and WC > 84 cm [5]. Women with difficulty of expression, pregnant or nursing, using chemotherapy drugs, anorexic agents/appetite suppressants or psychiatric disorders were excluded.

Data collection was performed after the signature of the written informed consent form, using a structured questionnaire to meet the objectives of outpatient care. The studied variables included age (years), skin color (self-referred), schooling and income. The weight was measured (kg) and body composition (lean mass, fat mass and percentage of body fat) using bioimpedance scales (equipment InBody 520, Biospace®), with a capacity of up to 250 kg. Height was measured using a portable stadiometer (Altura Exata TBW, Sao Paulo, Brazil) limited to 2.1 m and precision of 1.0 cm; the individual remained facing backwards, in an erect position, barefoot, with feet parallel to each other, heels joined, calves, hips, shoulders, scapular region and head against the stadiometer, with the head at the Frankfurt horizontal plane [6]. The BMI represents the ratio of the weight by the height squared (BMI = weight (kg)/height (m2)). The BMI of 25 kg/m2 was used as the lowest limit for excess weight, used to calculate the percentage of BMI loss (%WL) [5]. The standard weight was considered the weight on the first evaluation and for the calculation of the ideal weight BMI 21.5 kg/m2 was defined [6]. Weight loss (%WL) was assessed and excess weight loss (%EWL) of overweight/obese patients, using the following formula:

%WL = ((iniital weight - present weight)/initial weight) × 100

%EWL = ((initial weight - present weight)/initial weight - ideal weight) ×100

WC was measured using an inelastic tape measure, 0.5 cm scales, horizontal plane, having as reference the midpoint located between the last rib and the right iliac crest. Classification as increased when equal to or greater than 84 cm according to the cut-off point indicated by Barbosa et al [7].

The biochemical variables were determined in blood collected after a 12-h fast. Borderline values used for classification of alterations were: 1) Fasting blood glucose levels considered as elevated when superior to 100 mg/dL; 2) Alterations in the lipid profile were classified as hypercholesterolemia (total cholesterol (TC) > 200 mg/dL), hypertriglyceridemia (triglycerides, ≥ 150 mg/dL), low level of HDL-C when < 40 mg/dL and high level of LDL-C > 100 mg/dL [8].

For assessment of dietary intake, three 24 h (R24h) recalls were used, two collected during the week (Tuesday and Thursday) and another on Sunday, with 7-day interval to contemplate the dietary variations that could occur during the week, describing in an accurate manner the consumption, types of meals, preparation, household measures, quantities and times of consumption, including the ingestion of macronutrients (carbohydrates, lipids, protein), dietary fibers and micronutrients (vitamins and minerals). The data obtained were converted into energy and nutrients using the Nutwin® program [9], performed through double entry to certify that the data were included correctly. Support tables were used [10, 11] for the inclusion of food or ingredients unavailable in the program [9]. Nutrients were adjusted by energy according to the residual method, to eliminate the influence of calories in the consumption of nutrients, whereby the calories are considered as independent variables and nutrients as dependent variables, accordingly the “adjusted” nutrient represents the actual value of each ingested nutrient without the influence of total energy consumed. The consumption of fibers was assessed according to the recommendations established by the Dietary Reference Intakes (DRI) Committee, in which women should consume a minimum of 21 g of fibers/day [12]. The criteria for the consumption of fat was established in accordance with the Sociedade Brasileira de Cardiologia (Brazilian Cardiology Society) [13] in consonance with the recommendations of the National Heart Lung and Blood Institute of the USA [14], which proposes a consumption of saturated fat of less than or equal to 7% of total daily energy consumption, lower than or equal to 10% of the total daily consumption of polyunsaturated fat and lower than or equal to 20% of the daily consumption of monounsaturated fat. The daily ingestion value was compared to the total energy expenditure (TEE) obtained using the DRI formula for gender, age and physical activity.

Nutritional guidance was performed individually and involved the adequate form of preparation and consumption, the importance of macro- and micronutrients, as well as stimulating the creation of new eating habits.

For the purpose of analysis, data were initially organized on Excel worksheets, with double entries. Subsequently, for statistical analysis, exported to the SPSS program, version 18.0 [15].

The verification of the normal distribution of data was performed using the Kolmogorov-Smirnov test, the comparison of the mean values was made by means of the paired Student’s t-test, and associations through the Chi-square test, with a confidence level of P < 0.05 and confidence interval of 95%. For energy and nutrient consumption estimates, the Nutwin®, Version 1.5 software for nutritional assessment was used [9].

Results▴Top 

Table 1 demonstrates the demographic and socioeconomic profile of 89 women with central obesity. Average age was of 48.5 ± 12.4 years, with 51 (57.3%) between 40 - 59 years and 11 (12.3%) ≥ 60 years. Predominance was for skin color brown, 44 (48.8%), followed by black, 37 (33.5%), and a minority of white, 11 (12.5%). Schooling levels of the majority were incomplete secondary school, 49 (54.4%), followed by incomplete elementary school, 35 (38.8%). Family income was predominantly of 1.5 - 2.5 minimum wages, 57 (64%), followed by under 1.5 minimum wage for 23 (25.8%).

Table 1.
Click to view
Table 1. Demographic and Economic Profile of Women With Central Obesity Treated at the EWLEa Project at EBMSPb, in Salvador, Bahia (N = 89)
 

In Table 2 average daily consumption of energy is presented, calculated from the 24-h recalls, including carbohydrates, proteins, total lipids and fibers. It was verified that there was no significant difference between energetic ingestion, initial and final (P > 0.05). Nevertheless, in relation to macronutrients, a significant decrease was observed in the consumption of carbohydrates (P = 0.002) in parallel to an increase in the consumption of fibers (P = 0.04). On the other hand, it should be observed that despite not having evidenced a significant difference between the baseline and final values in the total consumption of lipids (P = 0.74), the percentage of consumption in the recommended range of 15 to 30% of total calories increased 5.5 times, 12 g (13.48%) versus 65g (73.86%).

Table 2.
Click to view
Table 2. Results After Accompaniment of Quarterly Outpatient Nutritional Intervention* for 48 months, of Daily Consumption of Macronutrients, Fibers and Energy in Women With Central Obesity Treated at the EWLEa Project at EBMSPb, in Salvador, Bahia (N = 89)
 

Table 3 presents the result of initial anthropometric and metabolic data and after 48 months of periodical, regular nutritional guidance as outpatients. It should be observed that there was a significant reduction in baseline and final values of WC (106.0 ± 12.5 cm vs. 100.2 ± 12.5 cm, P = 0.003), associated to a reduction in the percentage of body fat (43.23±7.7% vs. 40.9±6.4%, P = 0.04) and a significant increase in body water (32.5 ± 4.9 kg vs. 36.5 ± 5.1 kg, P = 0.05). On the other hand, there was no significant difference between the baseline and final values of weight (kg), BMI (kg/m2), lean mass (kg), TMB e GET. It should be observed that the average ideal weight (IW) calculated would be 53.4 ± 3.66 kg, about 32.23 kg less than the final average weight of the studied group.

Table 3.
Click to view
Table 3. Anthropometric Data, Body Composition, Biochemical and Baseline Metabolic Rates of Women With Central Obesity Treated at the EWLEa Project at EBMSPb, in Salvador, Bahia (N = 89)
 

Table 4 presents the result of initial clinical data and after 48 months of periodical, regular nutritional guidance, as outpatients. It should be observed that there was a significant decrease in baseline and final values of glycosylated hemoglobin (7.2 ± 1.4 vs. 6.3 ± 1.2, P = 0.04), fasting glycemia (129.4 ± 42.9 vs. 100.3 ± 22.4, P = 0.05). Although no significant difference was observed between the values of total cholesterol (P = 0.06), triglycerides (P = 0.07), HDL (P = 0.07), we observed a difference in LDL-C (126.8 ± 33.5 vs. 118.9 ± 30.8, P = 0.04).

Table 4.
Click to view
Table 4. Laboratorial Characteristics of Women With Central Obesity Treated at the EWLEa Project at EBMSPb, in Salvador, Bahia (N = 89)
 
Discussion▴Top 

This prospective study on the treatment of obesity in low income women represents an important contribution for awareness of the physiopathology of nutritional disorders and its treatment in this social group.

It should be observed that the type of obesity of these women is characteristic of central obesity, evidenced by the excessive accumulation of abdominal fat, without mean values of WC of 106 ± 12.5 cm, 22 cm above the cut-off point of 84 cm for the diagnosis of central obesity in a representative sample of the female population of Salvador city where they also reside [7].

Another important aspect is the association of this type of obesity with low caloric value of the diet, with an average of 1,495.2 ± 602.5 kcal, below the normal average value of 2,000 kcal for active women, with average heights of 1.58 m, represented in this sample. This finding of the association of obesity with a low calorie value of the diet seems to find an explanation in the proportion of the consumption of macronutrients that compose the initially referred basic diet, characterized by an excessive consumption of simple carbohydrates and low consumption of fiber. Accordingly, with the nutritional guidance for adjustments in the consumption to a diet with lower consumption of simple carbohydrates and an increase in the consumption of fibers in a period of accompaniment of 48 months, there was a significant alteration in the body composition, with a reduction in WC (106 ± 12.5 cm to 100.2 ± 11.3cm, P = 0.03) and of body fat (43.23 ± 7.7 kg to 40.9 ± 6.4 kg, P = 0.04) associated to an increase in body water (32.5 ± 4.9 kg to 36.5 ± 5.1 kg, P = 0.05). This simultaneous increase in body water explains the maintenance of the weight and the BMI, disqualifies the BMI and qualifies WC as specific anthropometric parameter for the diagnosis of central obesity and corroborates with the findings in literature which point out that interventions related to nutritional guidance with women are capable of promoting changes in anthropometric parameters, mainly those related to body mass and WC [16, 17].

There is a greater risk of accumulation of intra-abdominal adipose tissue mainly in middle-aged women (40 - 59 years). In this study the highest percentage was identified in this age group (57.3%) and it is known that the distribution of fat in the abdominal region is recognized as a risk factor for metabolic disorders and cardiovascular diseases [18]. Apart from this variable, the analysis of other socioeconomic variables, such as ethnicity, schooling and income, as well as its association with anthropometric, clinical and nutritional parameters in detriment of central obesity is of utmost importance, considering the lack of evidence published on such aspects. An example of this is the fact that white and black women, during middle-age, accumulate intra-abdominal adipose tissue in a similar manner, even when there isn’t a concomitant significant change in total body fat; nevertheless, there isn’t any clear understanding on racial differences in this alteration on a longitudinal level [19]. On an educational level, known to be beneficial to health and capable of producing obesogenic counter-effects through cognitive advantages resulting in healthier life styles, it has received greater attention [20-22].

Low schooling level is a variable that most contributes in literature to associated central obesity, justified by differences in health behaviors, including the consumption of food with better nutritional content, a clearer perception of risks related to the choices of life styles and improved self-control [18].

Du and collaborators [23] suggested that the diet seems to be more important than physical activity to explain the association between education and anthropometric markers of intra-abdominal adipose tissue. The education factor seems to influence the risk of obesity mainly for being associated to the consumption of industrialized food, rich in fat and sugar, nevertheless, in countries in dietary transition, including Brazil, receiving constant inflow of food products, such as processed food with low nutritional values [24]. For this reason the educational level of these women was considered, mainly made up of elementary education (n = 49, 54.4%), followed by incomplete elementary education (n = 35, 38.8%), based on the hypothesis that a lower period of time spent on education is relatively important for the association between the socioeconomic position and abdominal obesity.

Apart from the relation of these factors which presumably influence the obesogenic life style, others attributes of the socioeconomic position were also considered, such as marital status and income, after all, WC has an inverse association with the socioeconomic position and, particularly in the women assessed; this association was found in Brazilian studies performed in Sao Paulo [25], Goias [26], Maceio [27], Pernambuco [28] and Bahia [29] apart from other temporal analyses in other continents which also evidence an increase in prevalence and incidence of central obesity, associated to reduced socioeconomic situations in the female population, mainly in urban contexts [20-22].

It is recognized that the socioeconomic position influences individual access to goods and services related to food, physical activity and other healthy practices [30], as well as environmental conditions that can interfere in the association between the socioeconomic position and anthropometric parameters. In other words, a healthy standard which is comparable to food ingestion with greater quality tends to standardize anthropometric and clinical parameters. Among the studies that prospectively evaluate the relation of dietary standards and the accumulation of abdominal adipose tissue in an independent manner, Kimokoti and collaborators [31] determined that a high consumption of fat is inversely associated to the development of central obesity. Therefore, our findings corroborate the emerging consensus that the total quality of the diet is important to be considered when preparing strategies for maintaining adhesion to the nutritional treatment; once, even when usual dietary habits are kept without significant difference (P > 0.05), the quality of the diet may be adjusted with nutritional choices and at a cost in accordance with the low income of the women under study.

For Kimokoti and collaborators [31], women who consume a diet with more nutritive food, are less prone to an increase in clinical parameters associated to the development of metabolic diseases, especially waist circumference, than those with lower quality diets. This suggests that interventions to improve empiric dietary standards concentrate on the quality of the diet, may be promissory in terms of preventing the development of future metabolic diseases. Future studies need to consider multiple dietary evaluations, as well as the stability of specific dietary standards of this population and its relation with the anthropometric profile throughout time.

Another factor that could be related to this is the fact that women have a greater reactivity to stimuli related to food than men [32]. According to Luo and collaborators [33], wait circumference, independently of BMI, was positively correlated to the cerebral response to food images of high caloric content, suggesting a connection between the accumulation of abdominal fat and the high brain reward signal. Nevertheless, Bowen and collaborators [34] did not identify a direct relation between the diet and abdominal obesity, due to the fact that the effects of the diet on the distribution of body fat are, in reality, the result of cumulative exposure to established standards throughout time, and in particular, the fat becomes more centrally distributed in the measure in which the organism ages.

In the present study there was not any significant difference between the mean baseline value and the final value of the weight (kg), BMI (kg/m2), lean mass (kg), BMR and TEE, but considering also the maintenance of weight due to body water, there are accounts that a diet with quality food represents a significant indirect effect on initial weight loss through changes in behavior and health promotion. It is clear that the promotion of healthy behaviors is the most important strategy for a weight loss intervention and other long-term anthropometric, clinical and nutritional parameters [35]. In this context, our findings highlighted a significant mediator of changes in behavior, promoting health, in the path of the diet and a reduction of other important anthropometric measures among the participating women. Finally, the mechanism with which the outpatient care predicts improvement in these variables may be attributable to health promoting behavioral changes.

The mechanisms involving glycemic and lipidic alterations are characterized by a reduced rate of lipolysis and a decreased release of free fat acids (FFA) and proinflammatory adipokines, which consequently reduce the accumulation of intra-abdominal adipose tissue. Such change can contribute towards reducing the risk of developing diseases such as hypertension, hyperglycemia and hypertriglyceridemia, diabetes mellitus, among others [33]. In this regard, abdominal circumference has presented greater correlation with visceral adipose tissue, as compared to other anthropometric assessments for abdominal adiposity, being more informational as based on an underlying biological argument [21].

Therefore, despite the existence of a strong correlation between BMI and central obesity, metabolic alterations are more related to the latter, which, when above recommendation, is diabetogenic, atherogenic, pro-thrombotic and pro-inflamatory [33], for which reason its determination is necessary [36].

The main implication of the results of this study is due to the fact that potential mediators of this relation, such as socioeconomic, clinical and nutritional parameters were jointly explore to better understand their interferences in central obesity.

The lack of measurement of blood pressure is one of the limitations to the development of analysis of the relation among variables, in view that this variable represents an important parameter for the diagnosis of metabolic diseases possibly associated to central obesity.

An important aspect to be discussed refers to the adopted cut-off point to determine abdominal adiposity (≥ 80 cm for women; ≥ 94 cm for men), also used in other studies, guaranteeing greater predictiveness in relation to other cut-off points. Low values in the measure of abdominal circumference (low central adiposity) are a risk for cardiovascular diseases.

Conclusions

Outpatient care in this study was successful in contributing in a relevant manner towards the reduction of anthropometric measures among the women assessed in the research. This suggests that interventions in relation to dietary standards, concentrated on the quality of the diet should be applied to assist in the prevention of future diseases associated to central obesity.

Hopefully other researches will consider multiple dietary assessments, as well as the stability of specific dietary patters of this public and its relation with the anthropometric profile on a long term.

Financial Disclosure

This project was financed by FAPESB, by means of a Doctorate Grant for the author.


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Journal of Endocrinology and Metabolism is published by Elmer Press Inc.

 
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Journal of Endocrinology and Metabolism, bimonthly, ISSN 1923-2861 (print), 1923-287X (online), published by Elmer Press Inc.        
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the Committee on Publication Ethics (COPE) guidelines, and the Principles of Transparency and Best Practice in Scholarly Publishing.

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