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Original Article

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Effect of Restriction of Foods with High Fructose Corn Syrup Content on Metabolic Indices and Fatty Liver in Obese Children

Ibarra-Reynoso L. del R. · López-Lemus H.L. · Garay-Sevilla M.E. · Malacara J.M.

Author affiliations

Department of Medical Sciences, University of Guanajuato, Campus León, León, Mexico

Corresponding Author

Lorena del Rocío Ibarra-Reynoso

Department of Medical Sciences

University of Guanajuato, Campus León

20 de Enero 929, 37320 León, Mexico

rey221280@gmail.com

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Obes Facts 2017;10:332-340

Abstract

Objective: We examined the effect of restriction of foods with high fructose content in obese school children. Methods: In a clinical study, we selected 54 obese children 6 to 11 years old with high fructose consumption (>70 g/day) in order indicate dietary fructose restriction (<20 g/day) for 6 weeks. Anthropometry, liver ultrasound as well as glucose, insulin, lipids, leptin, IGFBP1, and RBP4 serum levels were collected. Results: The group of children had 80% adherence and reported decreased fructose consumption (110 ± 38.6 to 11.4 ± 12.0 g/day) and also a significant decrease in caloric (2,384 ± 568 to 1,757 ± 387 kcal/day) and carbohydrate consumption (302 ± 80.4 to 203 ± 56.0 g/day). The severity of steatosis improved significantly after fructose restriction (p < 0.000001). However, no changes in BMI, systolic blood pressure, or diastolic blood pressure were found. Only triglyceride levels decreased (1.44 ± 0.43 to 1.31 ± 0.38 mmol/l), High-densitiy lipoprotein cholesterol showed a marginal increase (1.45 ± 0.19 to 1.56 ± 0.44 mmol/l). Insulin resistance and RBP4 did not change. Conclusions: In school children, the restriction of high fructose foods with a decrease of caloric and carbohydrate intake at 6 weeks did not induce weight loss; however, triglyceride levels and hepatic steatosis decreased. Differences with other studies in regard to weight loss may be explained by adaptive changes on metabolic expenditure.

© 2017 The Author(s) Published by S. Karger GmbH, Freiburg


Introduction

Fructose is a monosaccharide present in fruits and syrup. Sucrose has been replaced by inexpensive, sweet high fructose corn-based syrups in our diet that meanwhile amount to 40% of all added caloric sweeteners [1]. Abundant information shows that a high consumption of fructose corn syrup may increase triglyceride levels, decrease insulin sensitivity [2], and promote visceral adiposity [3]. Furthermore, evidence shows that the acute ingestion of 60-75 g/day fructose corn syrup is also associated with dyslipidemia, worsening of blood pressure, and insulin resistance in obese children [4] and adolescents [5]. The increased fructose ingestion associated with fatty liver disease is also reported [6].

Fructose is metabolized in other pathways than glucose. The formation of fructose 1-phosphate is not reversible, and this metabolite is a substrate for de novo lipogenesis. Fructose intake also promotes glucose production as well as impairment of hepatic ATP recovery [7], with mitochondrial dysfunction and endoplasmic reticulum stress. These two factors may be involved in the formation of non-alcoholic fatty liver disease (NAFLD) [8]. Moreover, fructose is absorbed and delivered to the liver in much higher concentrations as compared to other tissues. Fatty liver disease is considered a precursor [9] for the development of metabolic disease.

NAFLD is the most common cause of chronic liver disease, which includes a spectrum ranging from simple steatosis to progressive nonalcoholic steatohepatitis with or without cirrhosis [10]. NAFLD is frequently associated with obesity, may appear early in life, and increases with age [11]. It also has been related to retinol binding protein-4 (RBP4) and is associated with whole body and hepatic insulin resistance measured by homeostatic model assessment-insulin resistance (HOMA-IR) and insulin like growth factor binding protein 1 (IGFBP1) respectively [12]. This process is mediated by inflammation [13], and visceral adiposity [14].

Pediatric NAFLD may show different characteristics to adult NAFLD, mainly in terms of histology [15,16], prevalence, diagnostic features, and management [17]. It remains to be determined if there are possible differences in natural history, etiopathogenesis, prognosis, or response to treatment. Therefore, detailed studies about NAFLD in pediatric patients are urgently needed.

Given the high fructose consumption in the Mexican population (>70-168 g/day) [18,19] and its association with obesity, insulin resistance and NAFLD, the effect of fructose restriction needs a full exploration. Studies on the effect of fructose restriction show conflicting results [18,20]. In the present study, we studied obese children with and without NAFLD and with high daily fructose intake who were pescribed to a restriction of foods and drinks with high fructose corn syrup while recommending to avoid other modifications on previous food intake. We examined the effect of this restriction on weight, fatty liver as well as metabolic and hormone levels.

Material and Methods

We carried out a clinical, longitudinal, study in 54 obese children 6 to11 years old (27 females and 27 males). The participants were recruited from grammar schools from the city of León, Mexico. They were apparently healthy, did not receive any nutritional treatment, and consumed more than 70 g fructose per day. In the group of girls 25 (92.6%) were at pre-menarche, and only 2 girls (7.4%) were at post-menarche.

Selected children had normal glucose levels, stable weight, and normal blood pressure. The two girls at post-menarche had regular menstrual cycles and no hirsutism.

Children were considered obese if their equivalents to adult BMI, after adjustment for gender and age, were higher than 30 kg/m2, according to the international tables of Cole et al. [21].

To identify children from grammar schools with high fructose corn syrup consumption (>70 g/day), a screening of 108 children was carried out by experienced personnel, calculating food consumption with a 24-hour dietary recall. Obese children with high fructose consumption were invited. Those who accepted participation were instructed to continue their usual diet but to eliminate foods and drinks with high fructose corn syrup content. The fructose was restricted to a maximum of 20 g/day for 6 weeks, as reported in previous studies in children [20].

Data Collection

The group was evaluated at baseline and after 6 weeks by collecting clinical and anthropometric data, and a fasting blood sample for hormones and metabolites. Hepatic steatosis was assessed by ultrasound.

Waist girth, weight, and standing height were obtained by trained personnel according to standard techniques [22], and BMI was calculated.

A venous blood sample was obtained after 12 h fasting to measure glucose, triglycerides, and cholesterol by conventional methods. Insulin (ALPCO, Salem, NH, USA), leptin (ALPCO), and RBP4 (RayBiotech, Norcross, GA, USA) were measured by ELISA with intra- and inter-assay variation coefficients of 2.7% and 5.8% for insulin, 6.0% and 8.0% for leptin, 6.1% and 7.0% for IGFBP1, and 5.9% and 5.6% for RBP4. Insulin resistance was considered with HOMA-IR > 2.67 for boys and > 2.22 for girls [23].

Liver Ultrasound

Fatty liver was assessed by ultrasound, an appropriate and practical method [24]. The procedure was carried out by a physician radiologist using a General Electric Logic 400 MD (General Electric, Boston, MA, USA) with a convex transducer of 3.6 MHz. The results were assessed by two experienced radiologists, classifying the extent of liver steatosis in four groups according to Mittelstaedt [25]: negative, slight, moderate and severe.

Diet Evaluation

Food intake was evaluated with a 24-hour dietary recall for 3 days (two at midweek and one at weekend). In all cases, 24-hour dietary recall (before and after interventions) was carried out by a certified nutritionist and answered by the child and at least one parent. Macronutrients were quantified using the NutriKcal® (Nitrical, Mexico City, Mexico) program. Fructose consumption was evaluated according to Matthews et al. [26], using the SNUT program [27].

According to the study protocol, children are to be excluded from the study when their adherence in terms of fructose consumption was less than 80% or if they reported an intercurrent disease, and to be replaced by a new volunteer. Adherence to the diet was assessed with a 24-hour dietary recall conducted 3 days/week (two at midweek and one at weekend).

Ethics

When candidates met inclusion criteria, the nature and purpose of the study was explained to them and at least one of their parents. If both the child and the parent or tutor accepted, they signed informed consent; confidentiality of individual results was guaranteed. The study meets the standards of the Declaration of Helsinki and was approved by the Institutional Ethics Committee.

Statistical Analysis

We described continuous variables with means and standard deviations, and discrete variables with percentages, and used the Komogorov-Smirnov test to examine normal distribution.

The effect of the intervention on the variables studied was analyzed by a paired t-test. Changes (Δ) in the stages of fatty liver were assessed using a chi-square test. We examined the factors associated with Δ in dietary fructose, i.e. HOMA-IR, RBP4 and leptin, with a stepwise forward multiple regression procedure taking as candidate regressors, age, and Δ BMI, waist girth, systolic and diastolic blood pressure, glucose, triglycerides, total cholesterol, high-density lipoprotein cholesterol (HDL-cholesterol), low-density lipoprotein cholesterol (LDL-cholesterol), and IGFBP1 levels. Factors related to changes in steatosis gradation were examined with ANOVA. The Statistics V5 (X-formation, Tilst, Denmark) software was used. Significance was considered at p < 0.05.

Results

All 54 children included in the study finished intervention and had adherence to fructose restriction higher than 80%. After the restriction, triglyceride levels decreased from 1.44 ± 0.43 to 1.31 ± 0.38 mmol/l (p < 0.01), but no changes in BMI, waist girth, lipid, HOMA-IR, RBP4, IGFBP1, and leptin levels were found (table 1).

Table 1

Basal anthropometric, metabolic and hormonal characteristics before and after restriction of fructose-rich food

/WebMaterial/ShowPic/867029

In the present study, our indication to restrict foods and drinks rich in fructose corn syrup was accompanied by the recommendation for no other modification of food intake. However, the analysis showed that the participants decreased calorie intake (table 1).

Liver Steatosis

The ultrasound studies showed that liver steatosis before intervention was negative in 17 children, slight in 22, moderate in 11, and severe in 4. After dietary intervention, a clear improvement was found; steatosis was negative in 18, slight in 26, moderate in 10, and nobody showed a severe grade (p < 0.00001) (table 2).

Table 2

Changes in liver steatosis

/WebMaterial/ShowPic/867028

At the basal evaluation we found that with increased steatosis HOMA-IR was also increased (p < 0.02) (table 3).

Table 3

ANOVA for factors related with basal liver steatosis

/WebMaterial/ShowPic/867027

After 6 weeks, higher gradation of steatosis was associated with higher systolic blood pressure (p < 0.03), diastolic blood pressure (p < 0.03), HOMA-IR (p < 0.007), and marginally higher waist girth (p = 0.06) (table 4).

Table 4

ANOVA for factors related with liver steatosis after diet

/WebMaterial/ShowPic/867026

Factors Associated with Metabolic Changes

We analyzed the factors associated with the changes. Δ fructose intake was associated with Δ HDL-cholesterol (p < 0.04) and Δ triglycerides (p < 0.006) (table 5). The Δ HOMA-IR was associated with Δ leptin levels (p < 0.03). Δ RBP4 was associated with Δ total cholesterol (p < 0.004). Δ leptin level was associated with Δ triglycerides (p < 0.006) and Δ BMI (p < 0.03).

Table 5

Multiple stepwise regression coefficients for factors associated with metabolic changes in the group with fructose restriction

/WebMaterial/ShowPic/867025

Discussion

The influence of fructose on the physiopathology of children's obesity has been demonstrated by experimental and clinical studies [28]. Therefore, weight reduction programs may be reinforced with emphasis in lower fructose intake. In this study, we examined the effect of the elimination of food and drinks rich in fructose corn syrup, recommending not to make any other food modifications. However, inadvertently for the children, this brought about reduced caloric intake. After 6 weeks, energy and carbohydrate intake decreased by 26.3% and 32.8%, respectively. The reported diminution of caloric intake may be explained by the reduction of the well-known orexigenic effect of sweet meals [29].

This unplanned reductionof caloric intake, however, did not induce a significant weight loss. We do not consider methodological explanations for this because the personnel involved was the same for evaluation before and after intervention, but it is important to remark that the 24-hour dietary recall can be under-reported as we used self-reported data. This lacking weight change is a frequent observation during treatment of obesity that may have several explanations: During caloric restriction there is an acute adaptation of energy expenditure that varies in different populations [30]; this adaptive decrease of tissue metabolism depends on genetic characteristics [31]. A compensatory reduction of activity also occurs during caloric restriction [32]. Additionally, dietary changes may modify the gut microbiota with an effect on nutrient absorption [33]. Yet, it is also possible that our data are falsified by under-reporting as a result of using a self-reported 24-hour dietary recall.

Systematic reviews and meta-analyses of controlled trials under isoenergetic conditions showed no association between the reduced intake of dietary sugars and changes in BMI [34]. Possible genetic or ethnic differences may modify the metabolic actions of fructose [35,36]. It is also possible that other components in diet may interact with fructose for the metabolic outcome, as reported for the sodium content in diet [37].

Our results did not show any effect of fructose restriction on insulin resistance. This agrees with a recent report in adults, in which the replacement of sugar by artificially sweetened beverages induced a significant decrease in intrahepatic fat, with no changes in body weight or insulin resistance [38]. Our data difered from those of Lustig et al [20] who found weight loss and metabolic improvement with only 9 days of isocaloric substitution of fructose with starch.

After 6 weeks of fructose restriction, in spite of the unchanged insulin sensitivity, triglycerides diminished. This indicates that the effect of excess fructose consumption on triglycerides may be reverted with no changes in BMI or insulin sensitivity.

The frequency of fatty liver in adolescents varies in different populations. In Hispanic populations this alteration is widespread [39]. In a previous work, we found that in obese children not selected for high fructose consumption the frequency of fatty liver was 42.6% [40]. In the present study, that focused on children with fructose consumption >70 g/day, 73.1% of participants presented with fatty liver. After intervention, an important decrease in liver steatosis was observed. Previous reports suggest changes on steatosis depend not only on obesity but also on the metabolic condition [41]. This finding is in agreement with previous work in which liver fat may diminish at an early stage of caloric [42] or fructose restriction [43]. As expected, we found HOMA-IR associated with the progression of liver steatosis.

In this study, metabolic changes induced by food restriction are consistent with expected interactions, e.g., fructose restriction leads to decreases in triglyceride and increases in HDL-cholesterol levels. The positive association of HOMA-IR with leptin changes can be explained by the dependence of both factors on obesity. The association of RBP4 and total cholesterol has been also reported [44]. The relationship of leptin levels with triglycerides and BMI is consistent with dependence of leptin levels on adiposity [45].

A limitation of our study is that restricting foods and beverages rich in fructose corn syrup inadvertently brings about changes in food, leading to reduced caloric diet. Finally, the present investigation is a non-controlled and non-randomized study carried out in normal obese children, with the opportunity to carry out modifications in their diet. This fact limits the extrapolation of results to the whole population.

Conclusions

In summary we found that fructose restriction was associated with diminution of triglyceride levels and an important diminution of liver steatosis. However, our results did not show any changes of body weight or insulin resistance, which may be explained by adaptive changes in metabolic expenditure.

Ethics Approval and Consent to Participate

When candidates met inclusion criteria, the nature and purpose of the study was explained to them and at least one of their parents. Both children and parents signed informed consent; confidentiality of results was guaranteed. The study was approved by the Ethics Committee of the Institution (CE-2013-9).

Funding

This study was supported by a grant from CONACYT (GTO-2012-C03-195255).

Authors' Contributions

LIR, JMM, and MEGS designed the research; LIR and HLLL oversaw data collection; HLLL was responsible for the dietary restriction; LIR and JMM performed statistical analyses and wrote the manuscript; LIR, HLLL, MEGS and JMM were involved in revision of the manuscript. All authors read and approved the final manuscript.

Disclosure Statement

The authors declare that they have no competing interests.


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    External Resources

Author Contacts

Lorena del Rocío Ibarra-Reynoso

Department of Medical Sciences

University of Guanajuato, Campus León

20 de Enero 929, 37320 León, Mexico

rey221280@gmail.com


Article / Publication Details

First-Page Preview
Abstract of Original Article

Received: November 02, 2016
Accepted: April 20, 2017
Published online: August 05, 2017
Issue release date: August 2017

Number of Print Pages: 9
Number of Figures: 0
Number of Tables: 5

ISSN: 1662-4025 (Print)
eISSN: 1662-4033 (Online)

For additional information: https://www.karger.com/OFA


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References

  1. Bray GA, Nielsen SJ, Popkin BM: Consumption of high-fructose corn syrup in beverages may play a role in the epidemic of obesity. Am J Clin Nutr 2004;79:537-543.
    External Resources
  2. Stanhope KL, Schwarz JM, Keim NL, Griffen SC, Bremer AA, Graham JL, Hatcher B, Cox CL, Dyachenko A, Zhang W, McGahan JP, Seibert A, Krauss RM, Chiu S, Schaefer EJ, Ai M, Otokozawa S, Nakajima K, Nakano T, Beysen C, Hellerstein MK, Berglund L, Havel PJ: Consuming fructose-sweetened, not glucose-sweetened, beverages increases visceral adiposity and lipids and decreases insulin sensitivity in overweight/obese humans. J Clin Invest 2009;119:1322-1334.
  3. Stanhope KL, Havel PJ: Fructose consumption: potential mechanisms for its effects to increase visceral adiposity and induce dyslipidemia and insulin resistance. Curr Opin Lipidol 2008;19:16-24.
  4. Jin R, Le NA, Liu S, Farkas Epperson M, Ziegler TR, Welsh JA, Jones DP, McClain CJ, Vos MB: Children with NAFLD are more sensitive to the adverse metabolic effects of fructose beverages than children without NAFLD. J Clin Endocrinol Metab 2012;97:E1088-1098.
  5. Brown CM, Dulloo AG, Yepuri G, Montani JP: Fructose ingestion acutely elevates blood pressure in healthy young humans. Am J Physiol Regul Integr Comp Physiol 2008;294:730-737.
  6. Thuy S, Ladurner R, Volynets V, Wagner S, Strahl S, Königsrainer, Maier KP, Bischoff SC, Bergheim I: Nonalcoholic fatty liver disease in humans is associated with increased plasma endotoxin and plasminogen activator inhibitor 1 concentrations and with fructose intake. J Nutr 2008;138:1452-1455.
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