<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0212-1611</journal-id>
<journal-title><![CDATA[Nutrición Hospitalaria]]></journal-title>
<abbrev-journal-title><![CDATA[Nutr. Hosp.]]></abbrev-journal-title>
<issn>0212-1611</issn>
<publisher>
<publisher-name><![CDATA[Grupo Arán]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0212-16112016000600032</article-id>
<article-id pub-id-type="doi">10.20960/nh.810</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Conducta alimentaria en niños]]></article-title>
<article-title xml:lang="en"><![CDATA[Eating behavior in children]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Oyarce Merino]]></surname>
<given-names><![CDATA[Karina]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valladares Vega]]></surname>
<given-names><![CDATA[Macarena]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
<xref ref-type="aff" rid="A03"/>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Elizondo-Vega]]></surname>
<given-names><![CDATA[Roberto]]></given-names>
</name>
<xref ref-type="aff" rid="A05"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Obregón]]></surname>
<given-names><![CDATA[Ana María]]></given-names>
</name>
<xref ref-type="aff" rid="A06"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad San Sebastián Facultad de Medicina ]]></institution>
<addr-line><![CDATA[Concepción ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Observatorio Regional Unidad de Salud ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad San Sebastián Paz Y Seguridad -ORPAS  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A04">
<institution><![CDATA[,Universidad Bernardo O`Higgins  ]]></institution>
<addr-line><![CDATA[Santiago Región Metropolitana]]></addr-line>
<country>Chile</country>
</aff>
<aff id="A05">
<institution><![CDATA[,Universidad de Concepción Facultad de Ciencia Biológicas ]]></institution>
<addr-line><![CDATA[Concepción Región del Bío Bío]]></addr-line>
<country>Chile</country>
</aff>
<aff id="A06">
<institution><![CDATA[,Universidad de San Sebastián Facultad de Ciencias de la Salud Escuela de Nutrición y Dietética]]></institution>
<addr-line><![CDATA[Concepción ]]></addr-line>
<country>Chile</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2016</year>
</pub-date>
<volume>33</volume>
<numero>6</numero>
<fpage>1461</fpage>
<lpage>1469</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0212-16112016000600032&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0212-16112016000600032&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0212-16112016000600032&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Introducción: cambios socioculturales como el incremento en el sedentarismo y el consumo de alimentos ricos en grasas y azúcares, sumado a características genéticas, han producido un aumento en las cifras de obesidad a nivel mundial. La evaluación temprana en niños, mediante el establecimiento de perfiles genéticos asociados a obesidad y a la regulación metabólica y hedónica de la alimentación, complementado con estudios de la conducta alimentaria, nos permitiría predecir la predisposición a la obesidad en etapas adultas. Objetivo: revisar los conceptos asociados a la conducta alimenticia, enfocándose en la regulación hedónica, que puede convertirse en un parámetro predictivo de obesidad en niños. Material y métodos: se revisó la bibliografía asociada a obesidad infantil y a la regulación homeostática y hedónica de la obesidad, como también parámetros génicos asociados a la obesidad. En la búsqueda de artículos se incluyó el trabajo en animales y humanos (adultos y niños, pero con énfasis en niños). Resultados: se analizaron los mecanismos celulares de la regulación de la ingesta, así como los estudios de conducta alimentaria en niños, entregando antecedentes y carencias en el desarrollo investigativo para la predicción de la obesidad infantil. Conclusión: la regulación hedónica de la ingesta alimenticia en niños, como perfiles genéticos asociados a receptores de dopamina, puede convertirse en un importante predictor de la obesidad. Es necesario incrementar el número de estudios que permitan definir de mejor forma, cuáles son los mejores parámetros para predecir el desarrollo de la obesidad adulta.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Introduction: Socio-cultural changes such as increase in sedentary and high fat and sugar food intake, along with genetic characteristics, have produced an increase on obesity worldwide. Early evaluation in children, through the establishment of genetic profiles associated with obesity and metabolic and hedonic feeding regulation, complemented with feeding behavior studies would allow us to predict obesity predisposition at adult stages. Objective: To review concepts associated with feeding behavior regulation, focusing on hedonic control, which can become a predictive parameter of obesity in children. Material and methods: A review on child obesity papers and homeostatic and hedonic regulation of food intake literature was performed, including paper describing genetic parameters associated with obesity. In the articles search work on animals and humans (children and adults, but with emphasis on children) was included. Results: Cellular mechanisms of food intake regulation and also feeding behavior studies on children were analyzed, exposing background and deficiencies on research development for predicting child obesity. Conclusion: Hedonic regulation of feeding behavior in children, such as genetic profiles associated with dopamine receptors, can become important predictors of obesity. It is necessary to increase the number of studies that allows a better definition of which are the best parameters to predict obesity development in adulthood.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Obesidad infantil]]></kwd>
<kwd lng="es"><![CDATA[Conducta alimentaria]]></kwd>
<kwd lng="es"><![CDATA[Sistema de recompensa cerebral]]></kwd>
<kwd lng="es"><![CDATA[Dopamina]]></kwd>
<kwd lng="en"><![CDATA[Child obesity]]></kwd>
<kwd lng="en"><![CDATA[Feeding behavior]]></kwd>
<kwd lng="en"><![CDATA[Brain reward system]]></kwd>
<kwd lng="en"><![CDATA[Dopamine]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ 
    <p><a name="top"></a><font face="Verdana" size="2"><b>REVISI&Oacute;N</b></font></p>
    <p>&nbsp;</p>
    <p><font face="Verdana" size="4"><b>Conducta alimentaria en ni&ntilde;os</b></font></p>
    <p><font face="Verdana" size="4"><b>Eating behavior in children</b></font></p>
    <p>&nbsp;</p>
    <p>&nbsp;</p>
    <p><font face="Verdana" size="2"><b>Karina Oyarce Merino<sup>1</sup>, Macarena Valladares Vega<sup>2</sup>, Roberto Elizondo-Vega<sup>3</sup> y Ana Mar&iacute;a Obreg&oacute;n<sup>4</sup></b></font></p>
    <p><font face="Verdana" size="2"><sup>1</sup>Facultad de Medicina. Universidad San Sebasti&aacute;n. Concepci&oacute;n, Chile.    <br><sup>2</sup>Unidad de Salud del Observatorio Regional. Universidad San Sebasti&aacute;n Paz y Seguridad (ORPAS). Universidad Bernardo O'Higgins. Santiago, Regi&oacute;n Metropolitana, Chile.    ]]></body>
<body><![CDATA[<br><sup>3</sup>Facultad de Ciencias Biol&oacute;gicas. Universidad de Concepci&oacute;n. Concepci&oacute;n, Regi&oacute;n del B&iacute;o B&iacute;o. Chile.    <br><sup>4</sup>Escuela de Nutrici&oacute;n y Diet&eacute;tica. Facultad de Ciencias de la Salud. Universidad San Sebasti&aacute;n. Concepci&oacute;n, Chile</font></p>
    <p><font face="Verdana" size="2">Financiamiento otorgado por el Fondo Nacional de Desarrollo Cient&iacute;fico y Tecnol&oacute;gico -FONDECYT N.<sup>o</sup> 11130200, CONICYT.</font></p>
    <p><font face="Verdana" size="2"><a href="#bajo">Direcci&oacute;n para correspondencia</a></font></p>
    <p>&nbsp;</p>
    <p>&nbsp;</p>
<hr size="1">
    <p><font face="Verdana" size="2"><b>RESUMEN</b></font></p>
    <p><font face="Verdana" size="2"><b>Introducci&oacute;n:</b> cambios socioculturales como el incremento en el sedentarismo y el consumo de alimentos ricos en grasas y az&uacute;cares, sumado a caracter&iacute;sticas gen&eacute;ticas, han producido un aumento en las cifras de obesidad a nivel mundial. La evaluaci&oacute;n temprana en ni&ntilde;os, mediante el establecimiento de perfiles gen&eacute;ticos asociados a obesidad y a la regulaci&oacute;n metab&oacute;lica y hed&oacute;nica de la alimentaci&oacute;n, complementado con estudios de la conducta alimentaria, nos permitir&iacute;a predecir la predisposici&oacute;n a la obesidad en etapas adultas.    <br><b>Objetivo:</b> revisar los conceptos asociados a la conducta alimenticia, enfoc&aacute;ndose en la regulaci&oacute;n hed&oacute;nica, que puede convertirse en un par&aacute;metro predictivo de obesidad en ni&ntilde;os.    <br><b>Material y m&eacute;todos:</b> se revis&oacute; la bibliograf&iacute;a asociada a obesidad infantil y a la regulaci&oacute;n homeost&aacute;tica y hed&oacute;nica de la obesidad, como tambi&eacute;n par&aacute;metros g&eacute;nicos asociados a la obesidad. En la b&uacute;squeda de art&iacute;culos se incluy&oacute; el trabajo en animales y humanos (adultos y ni&ntilde;os, pero con &eacute;nfasis en ni&ntilde;os).    ]]></body>
<body><![CDATA[<br><b>Resultados:</b> se analizaron los mecanismos celulares de la regulaci&oacute;n de la ingesta, as&iacute; como los estudios de conducta alimentaria en ni&ntilde;os, entregando antecedentes y carencias en el desarrollo investigativo para la predicci&oacute;n de la obesidad infantil.    <br><b>Conclusi&oacute;n:</b> la regulaci&oacute;n hed&oacute;nica de la ingesta alimenticia en ni&ntilde;os, como perfiles gen&eacute;ticos asociados a receptores de dopamina, puede convertirse en un importante predictor de la obesidad. Es necesario incrementar el n&uacute;mero de estudios que permitan definir de mejor forma, cu&aacute;les son los mejores par&aacute;metros para predecir el desarrollo de la obesidad adulta.</font></p>
    <p><font face="Verdana" size="2"><b>Palabras clave:</b> Obesidad infantil. Conducta alimentaria. Sistema de recompensa cerebral. Dopamina.</font></p>
<hr size="1">
    <p><font face="Verdana" size="2"><b>ABSTRACT</b></font></p>
    <p><font face="Verdana" size="2"><b>Introduction:</b> Socio-cultural changes such as increase in sedentary and high fat and sugar food intake, along with genetic characteristics, have produced an increase on obesity worldwide. Early evaluation in children, through the establishment of genetic profiles associated with obesity and metabolic and hedonic feeding regulation, complemented with feeding behavior studies would allow us to predict obesity predisposition at adult stages.    <br><b>Objective:</b> To review concepts associated with feeding behavior regulation, focusing on hedonic control, which can become a predictive parameter of obesity in children.    <br><b>Material and methods:</b> A review on child obesity papers and homeostatic and hedonic regulation of food intake literature was performed, including paper describing genetic parameters associated with obesity. In the articles search work on animals and humans (children and adults, but with emphasis on children) was included.    <br><b>Results:</b> Cellular mechanisms of food intake regulation and also feeding behavior studies on children were analyzed, exposing background and deficiencies on research development for predicting child obesity.    <br><b>Conclusion:</b> Hedonic regulation of feeding behavior in children, such as genetic profiles associated with dopamine receptors, can become important predictors of obesity. It is necessary to increase the number of studies that allows a better definition of which are the best parameters to predict obesity development in adulthood.</font></p>
    <p><font face="Verdana" size="2"><b>Key words:</b> Child obesity. Feeding behavior. Brain reward system. Dopamine.</font></p>
<hr size="1">
    ]]></body>
<body><![CDATA[<p>&nbsp;</p>
    <p><font face="Verdana" size="2"><b>Introducci&oacute;n</b></font></p>
    <p><font face="Verdana" size="2">La obesidad es una enfermedad multifactorial que afecta a alrededor de 600 millones de personas en el mundo, de los cuales, cerca de 40 millones corresponden a ni&ntilde;os menores de 5 a&ntilde;os (OMS <i>factsheet</i> n<sup>o</sup>311; <a target="_blank" href="http://www.who.int/mediacentre/factsheets/fs311/en/">http://www.who.int/mediacentre/factsheets/fs311/en/</a>). En adultos se define por un &iacute;ndice de masa corporal (IMC) sobre 30 kg/m<sup>2</sup> y se caracteriza por un incremento excesivo en el porcentaje de grasa corporal, originado por un balance energ&eacute;tico positivo que se mantiene en el tiempo (1). La obesidad se asocia al desarrollo posterior de dislipidemias, hipertensi&oacute;n arterial e insulinorresistencia, los que favorecen la incidencia de diabetes mellitus, arterioesclerosis, enfermedades cardiovasculares, des&oacute;rdenes m&uacute;sculo-esquel&eacute;ticos y c&aacute;ncer (2). Diversos estudios se&ntilde;alan que el aumento en los &iacute;ndices de obesidad experimentados en el &uacute;ltimo tiempo se deben principalmente a cambios ambientales, como el incremento del sedentarismo (3-5) y la ingesta de alimentos altamente energ&eacute;ticos, ricos en grasas y az&uacute;cares (6,7), creando un escenario al que se le ha denominado "ambiente obesog&eacute;nico". Sin embargo, no todas las personas que viven en este ambiente obesog&eacute;nico responden de la misma forma a los est&iacute;mulos alimenticios, observ&aacute;ndose gran variabilidad en par&aacute;metros como el &iacute;ndice de masa corporal (IMC) y porcentaje de grasa abdominal entre los individuos de una misma poblaci&oacute;n. Esta variabilidad ser&iacute;a el resultado de la interacci&oacute;n entre componentes gen&eacute;ticos heredables y el entorno social y familiar al que los individuos se encuentran expuestos (8-12), los que afectar&iacute;an los mecanismos que regulan el apetito y el comportamiento alimentario (13,14).</font></p>
    <p><font face="Verdana" size="2">Diversos esfuerzos se han realizado por comprender en mayor profundidad los mecanismos que regulan el comportamiento alimentario, asociado a la mayor susceptibilidad de fallo ante los est&iacute;mulos obesog&eacute;nicos, pero la mayor parte de estos estudios se ha centrado en individuos adultos, siendo la obesidad infantil una tem&aacute;tica menos abordada en la literatura, pese al r&aacute;pido incremento de sus cifras a nivel mundial (15,16). En ni&ntilde;os, la tendencia a la obesidad tiene un origen a&uacute;n m&aacute;s complejo y multifactorial, y se ha mostrado que no existe una correlaci&oacute;n clara entre el consumo de ciertos alimentos espec&iacute;ficos y el peso corporal (con excepci&oacute;n de las bebidas azucaradas), sin embargo, s&iacute; es posible asociar determinados patrones conductuales con obesidad infantil (17). Por otra parte, el estudio de la conducta alimentaria en este segmento ha probado ser &uacute;til como indicador de la probabilidad de aumento de masa grasa en el tiempo (18), pudiendo constituir un elemento fundamental para predecir el sobrepeso y la obesidad de forma precoz, a diferencia del IMC que en edades tempranas no parece ser buen predictor de la incidencia de morbilidad asociada a obesidad en el adulto (19). Por lo anterior, el objetivo del presente art&iacute;culo es revisar los factores involucrados en la regulaci&oacute;n de la ingesta alimentaria y la conducta alimentaria en ni&ntilde;os.</font></p>
    <p>&nbsp;</p>
    <p><font face="Verdana" size="2"><b>Metodolog&iacute;a</b></font></p>
    <p><font face="Verdana" size="2">Se realiz&oacute; una exploraci&oacute;n electr&oacute;nica de art&iacute;culos originales y de revisi&oacute;n en el buscador acad&eacute;mico Google Scholar y la base de datos PubMed con los siguientes t&eacute;rminos: "obesidad", "obesidad infantil", "regulaci&oacute;n homeost&aacute;tica obesidad", "regulaci&oacute;n hed&oacute;nica obesidad", "conducta alimenticia", "ingesta alimenticia", "sistema de recompensa cerebral", "dopamina" y "polimorfismos gen dopamina". Esta revisi&oacute;n contempl&oacute; el trabajo en animales y humanos (adultos y ni&ntilde;os, pero con &eacute;nfasis en ni&ntilde;os), escritos en ingl&eacute;s y en espa&ntilde;ol y sin l&iacute;mites en el a&ntilde;o de publicaci&oacute;n.</font></p>
    <p>&nbsp;</p>
    <p><font face="Verdana" size="2"><b>Resultados</b></font></p>
    <p><font face="Verdana" size="2"><b>MECANISMO CELULARES DE LA REGULACI&Oacute;N DE LA INGESTA ALIMENTICIA</b></font></p>
    ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">En t&eacute;rminos generales, la ingesta alimenticia se encuentra regulada por dos sistemas altamente complejos e interconectados denominados mecanismos homeost&aacute;ticos y hed&oacute;nicos (20-23). Los mecanismos homeost&aacute;ticos son probablemente los m&aacute;s estudiados y corresponden a los que regulan los niveles de nutrientes en la sangre y los tejidos, a trav&eacute;s de la acci&oacute;n de hormonas que son secretadas a nivel perif&eacute;rico y que producen se&ntilde;ales de hambre o saciedad (24,25). Los mecanismos no homeost&aacute;ticos o hed&oacute;nicos, por otra parte, son los que regulan la ingesta a trav&eacute;s de se&ntilde;ales producidas a nivel de sistema nervioso central, particularmente en circuitos formados por neuronas que liberan el neurotransmisor dopamina y que producen sensaciones de bienestar o de recompensa despu&eacute;s de ingerir alimentos, o bien determinan la preferencia por ciertos alimentos sobre otros (26). Discutiremos brevemente acerca de los mecanismos homeost&aacute;ticos de regulaci&oacute;n de ingesta, para posteriormente revisar el mecanismo hed&oacute;nico que se conecta con la conducta alimentaria vinculada al refuerzo.</font></p>
    <p><font face="Verdana" size="2"><b>Mecanismos homeost&aacute;ticos de la ingesta</b></font></p>
    <p><font face="Verdana" size="2">Cl&aacute;sicamente se describe que la regulaci&oacute;n homeost&aacute;tica de los nutrientes y del balance energ&eacute;tico est&aacute; dada por se&ntilde;ales hormonales perif&eacute;ricas que son integradas a nivel central, espec&iacute;ficamente en el hipot&aacute;lamo, en regiones como el n&uacute;cleo ventromedial (VM) y n&uacute;cleo arqueado (NA) (27,28). En estas regiones cerebrales se localizan distintos grupos neuronales que al ser impactados por hormonas o directamente por nutrientes (como glucosa y lactato) son activados o inhibidos liberando neurop&eacute;ptidos que inducen sensaci&oacute;n de hambre o saciedad (23,27-29). La liberaci&oacute;n de estos neurop&eacute;ptidos a su vez regula la liberaci&oacute;n de las hormonas perif&eacute;ricas, complet&aacute;ndose un sistema de retroalimentaci&oacute;n. Las principales hormonas reguladoras de la ingesta, su lugar de s&iacute;ntesis, la localizaci&oacute;n de sus receptores y su respuesta fisiol&oacute;gica se resume en la <a href="#t1">tabla I</a>.</font></p>
    <p>&nbsp;</p>
    <p align="center"><font face="Verdana" size="2"><a name="t1"><img src="/img/revistas/nh/v33n6/revision5_tabla1.jpg"></a></font></p>
    <p>&nbsp;</p>
    <p><font face="Verdana" size="2">Estudios en modelos animales <i>knockout</i> para los genes de hormonas involucradas en el control de ingesta homeost&aacute;tico o sus receptores, adem&aacute;s de estudios farmacol&oacute;gicos en animales <i>wild type</i> muestran que el sistema homeost&aacute;tico cumple un papel preponderante en la regulaci&oacute;n de la ingesta, y que su desregulaci&oacute;n es capaz de generar obesidad o contrarrestarla en condiciones controladas de laboratorio (30-34). Sin embargo, este complejo sistema hormonal no es suficiente para controlar de manera adecuada la ingesta alimentaria y prevenir el desarrollo de la obesidad en un ambiente obesog&eacute;nico, siendo importante considerar la influencia del segundo sistema de regulaci&oacute;n: el no homeost&aacute;tico o hed&oacute;nico.</font></p>
    <p><font face="Verdana" size="2"><b>Sistema hed&oacute;nico de la ingesta (no-homeost&aacute;tico)</b></font></p>
    <p><font face="Verdana" size="2">Adem&aacute;s de satisfacer los requerimientos energ&eacute;ticos del organismo, la alimentaci&oacute;n produce sensaciones placenteras y reforzadoras, que conllevan a un comportamiento dirigido al sobreconsumo de alimentos. Esta conducta en respuesta a est&iacute;mulos considerados gratificantes (p. ej.: chocolate que produce sensaci&oacute;n de placer) y estados emocionales positivos se encuentran bajo el control del sistema hed&oacute;nico o sistema de recompensa cerebral (35,36). Este sistema est&aacute; formado por una red neuronal que conecta &aacute;reas como la corteza prefrontal, el hipot&aacute;lamo, am&iacute;gdala, &aacute;rea tegmental ventral (VTA) y n&uacute;cleo accumbens (NAc), las que est&aacute;n involucradas en la regulaci&oacute;n del apetito (27,37,38), la sensaci&oacute;n de placer (ya sea por consumo de alimento, comportamiento sexual, dinero etc.) (39), la respuesta emocional al miedo, la ansiedad y la interacci&oacute;n social (40,41).</font></p>
    <p><font face="Verdana" size="2">De todas estas regiones cerebrales, han recibido mayor atenci&oacute;n el VTA y NAc. El VTA corresponde a la porci&oacute;n ventral del cuerpo estriado en donde se sintetiza dopamina, uno de los principales neurotransmisores activadores de las v&iacute;as de recompensa (42,43); mientras que el NAc corresponde a la zona preferentemente inervada por las neuronas del VTA, y que por lo tanto responden al est&iacute;mulo de dopamina, constituyendo as&iacute; el circuito dopamin&eacute;rgico mesol&iacute;mbico (44).</font></p>
    ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">El papel de dopamina en la regulaci&oacute;n hed&oacute;nica de la ingesta ha sido demostrado en diferentes tipos de estudios, pero se desconoce con exactitud los mecanismos que subyacen a esta regulaci&oacute;n. Se piensa que evolutivamente este sistema ha dirigido el comportamiento del ser humano hacia metas que promueven su supervivencia, como la b&uacute;squeda de alimentos energ&eacute;ticos (alimentos que son m&aacute;s palatables). Sin embargo, en la actualidad el acceso a este tipo de alimentos es mayor y la activaci&oacute;n de este sistema podr&iacute;a en algunos individuos ser un componente principal en el desarrollo de la obesidad. En relaci&oacute;n a lo anterior, se sabe que alimentos altamente apetecibles, ricos en grasas y az&uacute;cares (helados, chocolates, pizza, etc.), incrementan los niveles de dopamina y sus metabolitos en roedores y humanos (42,45-47) e incluso, estudios en humanos han mostrado que solo la presentaci&oacute;n de im&aacute;genes de alimentos altamente energ&eacute;ticos o la anticipaci&oacute;n a una ingesta puede activar diversas regiones cerebrales relacionadas con las sensaciones gustatorias, la motivaci&oacute;n y la recompensa, observ&aacute;ndose una mayor activaci&oacute;n en individuos obesos (48-50).</font></p>
    <p><font face="Verdana" size="2">Por otra parte, se ha observado en estudios realizados en ratas, que la utilizaci&oacute;n de antagonistas de dopamina (que disminuyen la activaci&oacute;n del circuito dopamin&eacute;rgico), bloquea los efectos de recompensa alimentaria (disminuyendo el n&uacute;mero de veces que los animales presionan un dispositivo para obtener alimento m&aacute;s palatable) e incrementan el consumo del otro alimento disponible y el peso corporal (51-53). Estos resultados han impulsado la hip&oacute;tesis de que la hipofunci&oacute;n dopamin&eacute;rgica estimular&iacute;a la ingesta alimentaria (54).</font></p>
    <p><font face="Verdana" size="2">Por el contrario, los agonistas de dopamina (estimulan la activaci&oacute;n del circuito dopamin&eacute;rgico) como el metilpenidato, reducen el apetito y disminuyen el peso corporal (55). Un ejemplo de esto, es lo que ocurre cuando se trata con metilpenidato a ni&ntilde;os con d&eacute;ficit atencional, donde se produce una p&eacute;rdida de peso como efecto secundario (56,57).</font></p>
    <p><font face="Verdana" size="2">Sin embargo, existen estudios en pacientes con la enfermedad de Parkinson (deficientes en neuronas dopamin&eacute;rgicas) que muestran efectos opuestos. En ellos, se observa una disminuci&oacute;n en la ingesta alimentaria asociada a p&eacute;rdida de peso (58) y el uso de drogas (agonistas de dopamina) producen mayores deseos de comer, ocasionando en algunos individuos comportamientos adictivos, como el comer compulsivamente (59).</font></p>
    <p><font face="Verdana" size="2">De esta forma, hasta la fecha existe controversia respecto a los mecanismos por los cuales dopamina regula la ingesta y el peso corporal. A&uacute;n no est&aacute; claro si individuos obesos presentan una <i>hiperfunci&oacute;n</i> de este sistema, gener&aacute;ndose mayor sensaci&oacute;n de placer frente al consumo de alimentos, lo que se traducir&iacute;a en un mayor poder reforzador de los alimentos o, por el contrario, si individuos obesos experimentan una hipofunci&oacute;n (debido a un menor n&uacute;mero de receptores de dopamina), sintiendo menor placer por el alimento, lo que inducir&iacute;a un sobreconsumo de los alimentos como mecanismo compensatorio frente a la menor activaci&oacute;n de estos circuitos (54).</font></p>
    <p><font face="Verdana" size="2">Hasta la fecha se han descrito 5 receptores de dopamina a nivel cerebral (D1R-D5R), todos acoplados a prote&iacute;na G, de los cuales D1R y D2R son los m&aacute;s abundantes. El receptor D1 estimula el incremento en los niveles de AMPc intracelular, mientras que D2 los inhibe (54,60). El receptor de dopamina que m&aacute;s atenci&oacute;n ha recibido es el receptor D2, el cual se localiza en neuronas pre-sin&aacute;pticas, y act&uacute;a como autorreceptor, disminuyendo la excitabilidad neuronal y la s&iacute;ntesis y liberaci&oacute;n de dopamina (54).</font></p>
    <p><font face="Verdana" size="2">Estudios en animales muestran que en modelos de obesidad inducida por dieta altas en grasas, se observa una disminuci&oacute;n de los niveles de expresi&oacute;n y sensibilidad de D2R (61,62). Los estudios en humanos realizados con trazadores radioactivos y tomograf&iacute;a de positrones, apoyan los hallazgos en animales, observ&aacute;ndose menores niveles de expresi&oacute;n de D2R en el n&uacute;cleo estriado y menor capacidad de uni&oacute;n de dopamina en sujetos obesos (63-65).</font></p>
    <p><font face="Verdana" size="2">Es importante destacar que los estudios anteriores no hacen distinci&oacute;n entre las dos isoformas conocidas para D2R, generadas por <i>splicing</i> alternativo. Se sabe que en el cerebro se expresa una forma larga del receptor (D2RL) y una forma m&aacute;s corta, carente del ex&oacute;n 6 (D2RS), con roles distintos. D2RL actuar&iacute;a en neuronas post-sin&aacute;pticas, activando la se&ntilde;alizaci&oacute;n de dopamina, mientras que D2RS es la que se encontrar&iacute;a actuando como autorreceptor en neuronas pre-sin&aacute;pticas, inhibiendo la se&ntilde;alizaci&oacute;n por dopamina (66). Considerando estos antecedentes, se requieren m&aacute;s estudios para analizar la real contribuci&oacute;n de ambas isoformas de D2R al desarrollo de la obesidad.</font></p>
    <p><font face="Verdana" size="2">La presencia de polimorfismos de un solo nucle&oacute;tido (SNP) asociados al gen de D2R, por otra parte, hace a&uacute;n m&aacute;s complejo comprender el funcionamiento del circuito dopamin&eacute;rgico. Al respecto, se ha determinado que la presencia del SNP TaqIA (rs1800497) que cambia el nucle&oacute;tido C por T (variante A1) y se localiza 10.5 kB corriente abajo del inicio de transcripci&oacute;n del gen de D2R, produce una disminuci&oacute;n de 30 a 40% de los niveles de expresi&oacute;n de D2R (67,68) y se encuentra presente mayoritariamente en individuos obesos (69), siendo un buen predictor de conductas de refuerzo alimentario. En este sentido, un estudio realizado en mujeres mostr&oacute; que aquellas con mayor IMC poseen menor activaci&oacute;n del cuerpo estriado en respuesta a la ingesta de un <i>milkshake</i> de chocolate (alimento palatable) y que la presencia de la variante A1 disminuye a&uacute;n m&aacute;s esta respuesta (70), presentando evidencia a favor de la hip&oacute;tesis de la hipofunci&oacute;n o anhedonia.</font></p>
    <p><font face="Verdana" size="2"><b>ESTUDIO DE LA CONDUCTA ALIMENTARIA EN NI&Ntilde;OS</b></font></p>
    ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">La conducta alimentaria se define como el conjunto de acciones que establecen la relaci&oacute;n del ser humano con los alimentos. Se acepta generalmente que los comportamientos frente a la alimentaci&oacute;n se adquieren a trav&eacute;s de la experiencia directa con la comida en el entorno familiar y social, por la imitaci&oacute;n de modelos, la disponibilidad de alimentos, el estatus social, los simbolismos afectivos y las tradiciones culturales (71). Para poder evaluar la conducta alimentaria se ha descrito que existen dimensiones que influyen directamente en el proceso: a) Inicio de la alimentaci&oacute;n (relacionado con la b&uacute;squeda, apetito, motivaci&oacute;n por comer, respuesta hed&oacute;nica a los alimentos, y refuerzo alimentario); y b) t&eacute;rmino de la alimentaci&oacute;n (relacionados con saciedad, plenitud, o est&iacute;mulos externos que llevan a finalizar la ingesta). Los mecanismos de hambre y saciedad vinculados con estas dimensiones involucran a los sistemas homeost&aacute;ticos (balance energ&eacute;tico) y hed&oacute;nicos (respuesta afectiva al alimento). Es importante recalcar que un individuo puede aumentar su ingesta de alimentos por cualquiera de estas dos v&iacute;as. Ej.: Si un ni&ntilde;o posee una se&ntilde;al de saciedad d&eacute;bil, posterior al consumo de una comida, entonces tiene alto riesgo de sobreconsumo (<i>v&iacute;a homeost&aacute;tica</i>); o si disfruta mucho los alimentos y responde positivamente a est&iacute;mulos asociados con estos, tambi&eacute;n tiene alto riesgo de sobreconsumo (<i>v&iacute;a hed&oacute;nica</i>).</font></p>
    <p><font face="Verdana" size="2">Los investigadores han desarrollado una serie de herramientas sicom&eacute;tricas y de laboratorio para poder capturar la variabilidad individual en la conducta alimentaria. Estas herramientas miden: a) respuesta a los alimentos (9,72); b) comer en ausencia de hambre (73,74); c) valor reforzador del alimento (75,76); y d) restricci&oacute;n alimentaria (77,78). Todas estas herramientas est&aacute;n formadas por constructos y las dimensiones que miden se detallan en las tablas <a href="#t2">II</a> y <a href="#t3">III</a>.</font></p>
    <p>&nbsp;</p>
    <p align="center"><font face="Verdana" size="2"><a name="t2"><img src="/img/revistas/nh/v33n6/revision5_tabla2.jpg"></a></font></p>
    <p>&nbsp;</p>
    <p align="center"><font face="Verdana" size="2"><a name="t3"><img src="/img/revistas/nh/v33n6/revision5_tabla3.jpg"></a></font></p>
    <p>&nbsp;</p>
    <p><font face="Verdana" size="2">A continuaci&oacute;n detallaremos algunas investigaciones que han mostrado el comportamiento de estas dimensiones hacia la ingesta de alimentos.</font></p>
    <p><font face="Verdana" size="2"><b>RESPUESTA A LOS ALIMENTOS/ DISFRUTE DE LOS ALIMENTOS</b></font></p>
    <p><font face="Verdana" size="2">En ni&ntilde;os las dimensiones de la conducta alimentaria que m&aacute;s han captado la atenci&oacute;n del ambiente cient&iacute;fico son <i>respuesta a los alimentos y disfrute de los alimentos. La respuesta a los alimentos</i> se refiere al grado de inter&eacute;s y el nivel de deseo que tiene el ni&ntilde;o de pasar tiempo consumiendo alimentos (p. ej.: &#191;Mi hijo siempre est&aacute; preguntando por comida?). La medici&oacute;n de la respuesta a los alimentos indica una cuantificaci&oacute;n de la diferencia individual en respuesta a est&iacute;mulos alimentarios y puede entregar el grado de vulnerabilidad frente a un ambiente obesog&eacute;nico. Esta respuesta a los alimentos puede deberse a distintos factores como est&iacute;mulos externos o emociones. Al respecto, se ha observado que ciertos individuos presentan una sensibilidad mayor a est&iacute;mulos externos, como el f&aacute;cil acceso a la comida apetecible o la publicidad de esta, presentando un comportamiento alimentario externo que promueve el sobreconsumo (79-81). En otros casos, frente a emociones negativas como tristeza, ansiedad y rabia ciertos individuos incrementan el consumo de alimentos altamente palatables, lo que los lleva a incrementar el riesgo de ser obesos, mientras otros disminuyen su apetito y sub-consumen (82-84).</font></p>
    ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">El <i>disfrute de los alimentos</i> captura el grado en el cual un ni&ntilde;o encuentra que el comer le da placer (p. ej.: &#191;Mi hijo disfruta comiendo?). Todas estas dimensiones muestran muy buena consistencia interna, fiabilidad <i>test-retest</i> y estabilidad temporal (85).</font></p>
    <p><font face="Verdana" size="2">Estudios de validaci&oacute;n usando el test de comer en ausencia de hambre, se&ntilde;alan que la dimensi&oacute;n <i>respuesta a los alimentos y disfrute de la comida</i> se asocia positivamente con la ingesta energ&eacute;tica (86) e IMC en ni&ntilde;os. Adicionalmente, se ha observado mayor puntaje para esta dimensi&oacute;n en ni&ntilde;os obesos en relaci&oacute;n a los sobrepeso y normales (72,86-88).</font></p>
    <p><font face="Verdana" size="2"><b>Comer en ausencia de hambre</b></font></p>
    <p><font face="Verdana" size="2">Una prueba de laboratorio muy utilizada para determinar patrones de alimentaci&oacute;n y selecci&oacute;n de alimentos, evaluando las respuestas directamente desde los ni&ntilde;os, es medir el consumo desinhibido de alimentos, lo que se denomina comer en ausencia de hambre (89). En este paradigma el ni&ntilde;o/a primero consume una precarga de alimentos hasta sentirse satisfecho. Despu&eacute;s de un tiempo corto (usualmente 20 minutos) el ni&ntilde;o/a tiene la posibilidad de consumir alimentos altos en grasa y de gran palatabilidad de forma ad-libitum y en un contexto de juegos. De esta forma, se puede cuantificar el consumo de alimentos apetecibles posterior al consumo de una comida est&aacute;ndar que contiene una mezcla de alimentos y que pretende producir en el ni&ntilde;o una sensaci&oacute;n de saciedad (90). Diversos resultados muestran que ni&ntilde;os obsesos o en riesgo de ser obesos consumen significativamente m&aacute;s alimentos en ausencia de hambre que ni&ntilde;os con IMC normal (90-92), y que m&aacute;s a&uacute;n este comportamiento una vez que se establece permanece estable durante la infancia y adolescencia, particularmente en el g&eacute;nero masculino, relacion&aacute;ndose de manera directa con el porcentaje de grasa (18). Debido a que el comer en ausencia de hambre hasta la fecha ha probado ser un predictor estable del aumento de peso en ni&ntilde;os, actualmente se ha desarrollado un cuestionario, cuya aplicaci&oacute;n en ni&ntilde;os y adolescentes les permitir&iacute;a a los pediatras medir este par&aacute;metro de manera m&aacute;s r&aacute;pida (74).</font></p>
    <p><font face="Verdana" size="2"><b>Valor reforzador del alimento</b></font></p>
    <p><font face="Verdana" size="2">El refuerzo subjetivo experimentado cuando se consume un alimento de alta palatabilidad es un potente factor motivador de la ingesta (93). Un &iacute;ndice utilizado para evaluar este aspecto es el denominado <i>valor reforzador del alimento (VRA).</i> El VRA, se define como el esfuerzo que est&aacute; dispuesto a realizar un individuo para obtener un determinado alimento de su preferencia, comparado con otra alternativa alimentaria no tan deseable (p. ej.: pizza <i>vs.</i> fruta), o bien comparado con una alternativa no alimentaria <i>(sticker)</i>, pero que tambi&eacute;n es de su preferencia (75). El VRA puede ser evaluado en el laboratorio con un test de refuerzo. En este protocolo se le solicita al ni&ntilde;o/a que realice una determinada actividad (p. ej. presionar el bot&oacute;n de un <i>mouse</i> de un computador) por un n&uacute;mero determinado de veces para obtener un alimento sabroso que se considera reforzador. El n&uacute;mero de veces que el ni&ntilde;o/a debe presionar el bot&oacute;n va incrementando al ir transcurriendo los diferentes niveles de la prueba, y el ni&ntilde;o/a requiere presionar m&aacute;s veces el <i>mouse</i> del computador por la alternativa de alta palatabilidad en relaci&oacute;n al reforzador alternativo. Los individuos que muestran mayor esfuerzo por conseguir un alimento que consideran una recompensa son considerados individuos reforzadores y bajo este supuesto dedicar&aacute;n m&aacute;s tiempo y esfuerzo para comer que aquellos individuos que no consideran la comida como un refuerzo.</font></p>
    <p><font face="Verdana" size="2">Diversos estudios transversales han mostrado en adultos y en ni&ntilde;os que los individuos obesos tienen &iacute;ndices m&aacute;s altos de VRA, (por lo que se consideran m&aacute;s reforzadores) en comparaci&oacute;n con sujetos de peso normal (75,94,95). Consistente con estos estudios, un estudio de tipo longitudinal evalu&oacute; la conducta de ni&ntilde;os durante un a&ntilde;o y mostr&oacute; que aquellos ni&ntilde;os que al principio del estudio se clasifican como reforzadores, independiente de su IMC, incrementan m&aacute;s su masa corporal al finalizar el a&ntilde;o que los ni&ntilde;os clasificados como no reforzadores (18). Estos datos apoyan la teor&iacute;a de que el comportamiento reforzador del alimento antecede a un estado tendiente a la obesidad y permite predecir esta condici&oacute;n. Recientemente la utilizaci&oacute;n de esta prueba en ni&ntilde;os menores de 5 a&ntilde;os ha sido validada, con resultados similares a los mencionados anteriormente (96). En este contexto, Epstein y cols. han desarrollado una herramienta psicom&eacute;trica para evaluar en poblaci&oacute;n adulta el refuerzo alimentario, permitiendo su uso en estudios epidemiol&oacute;gicos de forma m&aacute;s r&aacute;pida y aplicable a la cl&iacute;nica (97).</font></p>
    <p><font face="Verdana" size="2"><b>Restricci&oacute;n alimentaria</b></font></p>
    <p><font face="Verdana" size="2">Al evaluar las conductas relacionadas al control de la alimentaci&oacute;n, se ha determinado que la ingesta se ve afectada por variables emocionales, cognitivas, ambientales y sociales (79). Intentos por medir el impacto de estas variables en la conducta alimentaria han establecido que ciertos individuos restringen su alimentaci&oacute;n para controlar su peso por razones est&eacute;ticas o sociales, sin embargo, este comportamiento restrictivo incrementa la sensaci&oacute;n de hambre y el refuerzo por los alimentos, aumentando su tendencia a sobre-alimentarse (76,79,98). Al respecto, se ha demostrado que ni&ntilde;os obesos tienen valores m&aacute;s altos de restricci&oacute;n diet&eacute;tica estando m&aacute;s susceptibles a consumir alimentos apetecidos despu&eacute;s de finalizar una dieta restrictiva (95). Por otra parte, ciertos estudios se&ntilde;alan que la promoci&oacute;n de h&aacute;bitos alimenticios saludables por parte de los padres, m&aacute;s que la restricci&oacute;n constante de alimentos "prohibidos", es una mejor estrategia para cambiar patrones conductuales, crear estilos de vida saludables y reducir la obesidad en ni&ntilde;os y adolescentes (99,100).</font></p>
    <p>&nbsp;</p>
    ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2"><b>Conclusiones</b></font></p>
    <p><font face="Verdana" size="2">Durante las &uacute;ltimas d&eacute;cadas, hemos observado a nivel mundial la generaci&oacute;n de un ambiente que favorece el sedentarismo y el consumo de alimentos con un alto contenido de grasas y carbohidratos, predisponiendo a la poblaci&oacute;n a sufrir de patolog&iacute;as asociadas a la obesidad. Sin embargo, a pesar este ambiente denominado obesog&eacute;nico, diversos factores tanto gen&eacute;ticos como sociales han producido respuestas variables (IMC, porcentaje de grasa, etc.) en la poblaci&oacute;n. En este contexto, los estudios nutricionales se han focalizado en observar el comportamiento alimentario adulto, evitando as&iacute; la evaluaci&oacute;n de un comportamiento predictivo en etapas tempranas del crecimiento, que den cuenta de una mayor predisposici&oacute;n a ser obeso en la adultez. En esta revisi&oacute;n, hemos descrito que la condici&oacute;n de obesidad y sus patolog&iacute;as asociadas durante la adultez, se encuentran principalmente ligadas a la regulaci&oacute;n de la ingesta de alimentos mediada por mecanismos homeost&aacute;ticos y hed&oacute;nicos. Interesantemente, el rol del sistema homeost&aacute;tico en la regulaci&oacute;n de la ingesta, ha sido validado principalmente en condiciones ambientales controladas, mientras que en un ambiente obesog&eacute;nico, los factores ambientales podr&iacute;an alterar esta regulaci&oacute;n, destacando la importancia de la regulaci&oacute;n hed&oacute;nica sobre el consumo de alimentos. Actualmente, diversos test son capaces de evaluar el comportamiento reforzador de algunos alimentos, el cual nos entrega un importante indicador predictivo de la obesidad adulta.</font></p>
    <p><font face="Verdana" size="2">Por otro lado, dentro del contexto de predicci&oacute;n de un comportamiento alimentario que produzca obesidad en etapas adultas, sin duda uno de los factores m&aacute;s relevantes, y que extra&ntilde;amente son evaluados rutinariamente, son los factores gen&eacute;ticos asociados a la obesidad. La evaluaci&oacute;n de la expresi&oacute;n de receptores de dopamina, como de isoformas producidas por <i>splicing</i> alternativo, muchos de los cuales poseen funciones antag&oacute;nicas en el desarrollo de la obesidad, adem&aacute;s de la presencia de polimorfismos espec&iacute;ficos de estos receptores, podr&iacute;an convertirse en importantes predictores de la obesidad adulta. La b&uacute;squeda temprana de estos factores, nos permitir&iacute;a generar pautas preventivas de la conducta alimentaria de forma individualizada, acorde con el ambiente obesog&eacute;nico en el cual vive el individuo y sus caracter&iacute;sticas gen&eacute;ticas. Esperamos que la implementaci&oacute;n de este tipo de an&aacute;lisis, como el incremento en el n&uacute;mero de estudios gen&eacute;ticos y de comportamiento alimenticio, nos permita en un futuro cercano poder predecir con certeza la predisposici&oacute;n a sufrir patolog&iacute;as asociadas a la obesidad.</font></p>
    <p>&nbsp;</p>
    <p><font face="Verdana" size="2"><b>Bibliograf&iacute;a</b></font></p>
    <!-- ref --><p><font face="Verdana" size="2">1. Martinez JA. Body-weight regulation: causes of obesity. Proc Nutr Soc 2000;59(3):337-45.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3914242&pid=S0212-1611201600060003200001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">2. Pi-Sunyer FX. The obesity epidemic: pathophysiology and consequences of obesity. Obes Res 2002;10(Suppl 2):97S-104S.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3914244&pid=S0212-1611201600060003200002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">3. 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    <p>&nbsp;</p>
    <p>&nbsp;</p>
    <p><font face="Verdana" size="2"><a href="#top"><img border="0" src="/img/revistas/nh/v33n6/seta.gif" width="15" height="17"></a><a name="bajo"></a><b>Direcci&oacute;n para correspondencia:</b>    <br>Ana Mar&iacute;a Obreg&oacute;n.    <br>Escuela de Nutrici&oacute;n y Diet&eacute;tica.    ]]></body>
<body><![CDATA[<br>Facultad de Ciencias de la Salud.    <br>Universidad San Sebasti&aacute;n.    <br>Campus Las Tres Pascualas.    <br>General Cruz 1577. Concepci&oacute;n, Chile    <br>e-mail: <a href="mailto:aniobregon@gmail.com">aniobregon@gmail.com</a> - <a href="mailto:aobregon@uss.cl">aobregon@uss.cl</a></font></p>
    <p><font face="Verdana" size="2">Recibido: 26/04/2016    <br>Aceptado: 03/06/2016</font></p>
     ]]></body><back>
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