<?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>0034-7531</journal-id>
<journal-title><![CDATA[Revista Cubana de Pediatría]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cubana Pediatr]]></abbrev-journal-title>
<issn>0034-7531</issn>
<publisher>
<publisher-name><![CDATA[Centro Nacional de Información de Ciencias MédicasEditorial Ciencias Médicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-75312010000400009</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Factores de riesgo aterosclerótico en el niño y adolescente obeso que pueden causar alteraciones del aprendizaje]]></article-title>
<article-title xml:lang="en"><![CDATA[Atherosclerosis risk factors in the obese child and adolescent that may to cause learning disorders]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Piñero Lamas]]></surname>
<given-names><![CDATA[Regino]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández-Britto Rodríguez]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ferrer Arrocha]]></surname>
<given-names><![CDATA[Marlene]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Centro de Investigación y Referencia de Aterosclerosis de La Habana  ]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2010</year>
</pub-date>
<volume>82</volume>
<numero>4</numero>
<fpage>89</fpage>
<lpage>97</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0034-75312010000400009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0034-75312010000400009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0034-75312010000400009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La obesidad es la forma más común de malnutrición y ha ido alcanzando proporciones epidémicas tanto en los países desarrollados como en los que se encuentran en vías de desarrollo. Existe en la actualidad una gran preocupación por las consecuencias de los factores de riesgo aterosclerótico desde edades tempranas de la vida, así como de las afectaciones psicosociales y cognitivas presentes en la obesidad. Se ofrece una revisión al respecto, partiendo de la consideración de que es importante que sean del conocimiento del personal responsable de la atención de estos niños y adolescentes.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Obesity is the commonest way of malnutrition and has achieved epidemic levels in developed countries and also in those underdeveloped. At the present time there is a great concern by the consequences of atherosclerosis risk factors from early stages of life, as well as of the psychosocial and cognitive affectations present in obesity. In this respect a review is offered from the consideration that all this be of knowledge of staff responsible for the care of these children and adolescents.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Factores de riesgo aterosclerótico]]></kwd>
<kwd lng="es"><![CDATA[obesidad]]></kwd>
<kwd lng="es"><![CDATA[niño]]></kwd>
<kwd lng="es"><![CDATA[adolescente]]></kwd>
<kwd lng="es"><![CDATA[alteraciones del aprendizaje]]></kwd>
<kwd lng="en"><![CDATA[Atherosclerosis risk factors]]></kwd>
<kwd lng="en"><![CDATA[obesity]]></kwd>
<kwd lng="en"><![CDATA[child]]></kwd>
<kwd lng="en"><![CDATA[adolescent]]></kwd>
<kwd lng="en"><![CDATA[learning disorders]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <div align="right"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">   <!-- Generation of PM publication page 1 -->   <B>TRABAJOS DE REVISI&Oacute;N </B></font></div>     <P ALIGN="left"><font size="2"><b><font size="4" face="Verdana, Arial, Helvetica, sans-serif">    <br>       <br>       <br>       <br>   Factores de riesgo ateroscler&oacute;tico en el ni&ntilde;o y adolescente obeso que pueden causar    alteraciones del aprendizaje </font>   </b> </font>     <P ALIGN="left">    <br>         <br>   <font size="2"><b><font size="3" face="Verdana, Arial, Helvetica, sans-serif">Atherosclerosis risk factors in the obese child and adolescent that may to cause learning disorders   </font>   </b></font>      <P ALIGN="left">    ]]></body>
<body><![CDATA[<br>         <br>         <br>         <br>   <font size="2"><b><font face="Verdana, Arial, Helvetica, sans-serif">Regino Pi&ntilde;ero    Lamas,<SUP>I</SUP> Jos&eacute; Fern&aacute;ndez-Britto    Rodr&iacute;guez,<SUP>II</SUP> Marlene Ferrer    Arrocha<SUP>III </SUP></font></b></font>     <P align="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><SUP>I </SUP>Doctor en Ciencias M&eacute;dicas. Especialista de II Grado en Endocrinolog&iacute;a. Profesor Titular.    Centro de Investigaci&oacute;n y Referencia de Aterosclerosis de La Habana. La Habana, Cuba. </font>    <br>   <font size="2" face="Verdana, Arial, Helvetica, sans-serif"><SUP>II </SUP>Doctor en Ciencias M&eacute;dicas. Especialista de II Grado en Anatom&iacute;a Patol&oacute;gica.    Profesor Acad&eacute;mico. Centro de Investigaci&oacute;n y Referencia de Aterosclerosis de La Habana.    La Habana, Cuba. </font>       <br>   <font size="2" face="Verdana, Arial, Helvetica, sans-serif"><SUP>III</SUP> M&aacute;ster en Investigaci&oacute;n en Aterosclerosis. Especialista de II Grado en Pediatr&iacute;a.    Profesor Auxiliar. Investigadora Agregada. Centro de Investigaci&oacute;n y Referencia de Aterosclerosis    de La Habana. La Habana, Cuba. </font>     <P ALIGN="left">    <br>         <br>         ]]></body>
<body><![CDATA[<br>         <br> <hr>       <P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><B>RESUMEN</B>     </font>     <P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La obesidad es la forma m&aacute;s com&uacute;n de malnutrici&oacute;n y ha ido alcanzando proporciones    epid&eacute;micas tanto en los pa&iacute;ses desarrollados como en los que se encuentran en v&iacute;as de desarrollo. Existe en    la actualidad una gran preocupaci&oacute;n por las consecuencias de los factores de riesgo    ateroscler&oacute;tico desde edades tempranas de la vida, as&iacute; como de las afectaciones psicosociales y cognitivas    presentes en la obesidad. Se ofrece una revisi&oacute;n al respecto, partiendo de la consideraci&oacute;n de que es    importante que sean del conocimiento del personal responsable de la atenci&oacute;n de estos ni&ntilde;os y adolescentes. </font>     <P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><B>Palabras clave</B>: Factores de riesgo ateroscler&oacute;tico, obesidad, ni&ntilde;o, adolescente, alteraciones    del aprendizaje. </font> <hr>     <P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><B>ABSTRACT</B> </font>     <P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Obesity is the commonest way of malnutrition and has achieved epidemic levels in developed    countries and also in those underdeveloped. At the present time there is a great concern by the consequences    of atherosclerosis risk factors from early stages of life, as well as of the psychosocial and    cognitive affectations present in obesity. In this respect a review is offered from the consideration that all    this be of knowledge of staff responsible for the care of these children and adolescents. </font>     <P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><B>Key words</B>: Atherosclerosis risk factors, obesity, child, adolescent, learning disorders. </font> <hr>     <P ALIGN="left">    <br>         ]]></body>
<body><![CDATA[<br>         <br>         <br>   <font size="3" face="Verdana, Arial, Helvetica, sans-serif"><B>INTRODUCCI&Oacute;N</B></font>      <P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La obesidad es la forma m&aacute;s com&uacute;n de malnutrici&oacute;n y ha ido alcanzando proporciones    epid&eacute;micas tanto en pa&iacute;ses desarrollados como en v&iacute;as de desarrollo. Existe en la actualidad una gran    preocupaci&oacute;n por las consecuencias de los factores de riesgo ateroscler&oacute;tico desde edades tempranas de la    vida,<SUP>1,2 </SUP>as&iacute; como de las afectaciones psicosociales y cognitivas presentes en la obesidad. </font>     <P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Se ha se&ntilde;alado que el desempe&ntilde;o escolar de los ni&ntilde;os obesos es inferior a los de peso normal;    sin embargo, las razones no est&aacute;n bien aclaradas    a&uacute;n.<SUP>3,4</SUP> Se ha se&ntilde;alado en estudios de ni&ntilde;os de    4to., 7mo. y 10mo. grado que a medida que el ni&ntilde;o crece y se hace adolescente, existe una    correlaci&oacute;n entre obesidad y desempe&ntilde;o escolar, no observaron ning&uacute;n alumno obeso con un desempe&ntilde;o    escolar excelente.<SUP>5 </SUP> Se ha se&ntilde;alado tambi&eacute;n que en los adultos j&oacute;venes y ancianos existe afectaci&oacute;n de    la memoria, con una relaci&oacute;n entre el &iacute;ndice de masa corporal (IMC) y la     memoria.<SUP>6</SUP> La adiposidad, frecuentemente medida indirectamente como el IMC, puede influenciar en las estructuras y    funciones del cerebro. Los cambios del tejido adiposo se producen durante toda la vida e influyen sobre    el desarrollo cerebral, en relaci&oacute;n con la funci&oacute;n cognitiva temprana y posterior    inteligencia.<SUP>7</SUP> </font>     <P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El que la obesidad afecte el aprendizaje y la memoria se ha se&ntilde;alado tambi&eacute;n sobre los animales    de experimentaci&oacute;n.<SUP>8,9</SUP> El estudio sobre nutrici&oacute;n y desarrollo cognitivo tiene a&uacute;n ciertas    limitaciones para establecer con certeza la interrelaci&oacute;n entre malnutrici&oacute;n (ya sea desnutrici&oacute;n u obesidad)    y rendimiento escolar, debido a otros factores relacionados (gen&eacute;ticos, hereditarios,    ambientales, psicosociales y educativos) que dificultan el dise&ntilde;o de investigaciones sobre el tema, su    evaluaci&oacute;n e interpretaci&oacute;n; no obstante,  se puede asumir que la funci&oacute;n cognitiva del escolar y su    rendimiento intelectual est&aacute;n muy  influenciados por el estado nutricional. </font>     <P ALIGN="left">    <br>         <br>   <font size="3" face="Verdana, Arial, Helvetica, sans-serif"><B>FACTORES DE RIESGO ATEROSCLER&Oacute;TICO QUE PUEDEN CAUSAR    ALTERACIONES DEL APRENDIZAJE</B></font>     <P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Los factores de riesgo ateroscler&oacute;tico en el ni&ntilde;o y adolescente obeso que pueden causar    alteraciones del aprendizaje son: </font>     ]]></body>
<body><![CDATA[<blockquote>       <p align="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">1.     Dislipidemia.     </font>    <br>     <font size="2" face="Verdana, Arial, Helvetica, sans-serif">2.     Resistencia a la insulina; diabetes mellitus de tipo 2.    </font>     <br>     <font size="2" face="Verdana, Arial, Helvetica, sans-serif">3.     Aumento de leptina (por resistencia a su acci&oacute;n). </font>      <br>     <font size="2" face="Verdana, Arial, Helvetica, sans-serif">4.     Aumento del factor de necrosis tumoral      (TNF-<font color="#000000">&alpha;</font>). </font>      <br>     <font size="2" face="Verdana, Arial, Helvetica, sans-serif">5.     Hipertensi&oacute;n arterial. </font>      <br>     <font size="2" face="Verdana, Arial, Helvetica, sans-serif">6.     Deficiencia de vitaminas antioxidantes.    </font>      <br>     <font size="2" face="Verdana, Arial, Helvetica, sans-serif">7.     Bajo peso al nacer.    </font>  </p> </blockquote>     <P ALIGN="left">    <br>   <font size="2" face="Verdana, Arial, Helvetica, sans-serif"><B>Dislipidemia</B></font>     ]]></body>
<body><![CDATA[<P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Se ha se&ntilde;alado que el aumento de los triglic&eacute;ridos produce inhibici&oacute;n en los receptores  del neurotransmisor cerebral glutamato y afectaci&oacute;n de los procesos  cognitivos.<SUP>10</SUP> Los ni&ntilde;os y  adolescentes obesos tienen con gran frecuencia aumento de los triglic&eacute;ridos. En estudios  realizados,<SUP>11 </SUP>encontramos su presencia en el 15,5 % de los obesos estudiados. Un nivel desfavorable del perfil lipoprot&eacute;ico y  la alteraci&oacute;n del metabolismo de la glucosa est&aacute; relacionado con la disminuci&oacute;n de funci&oacute;n  cognitiva. Estas 2 condiciones al igual  pueden disminuir el promedio de vida. </font>     <P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La asociaci&oacute;n de aumento de l&iacute;pidos y la disminuci&oacute;n de vitaminas antioxidantes son uno de    los factores que predisponen al ni&ntilde;o obeso a alto riesgo de aterosclerosis en edades    tempranas. Se ha se&ntilde;alado que la  hipertrigliceridemia (la principal dislipidemia de la obesidad) es en parte    responsable de la resistencia a la leptina que se observa en los obesos.    (La leptina est&aacute; relacionada con la funci&oacute;n cognitiva, mejora la neuroplasticidad). Adem&aacute;s, se ha observado que    la hipertrigliceridemia posiblemente impide funciones de los receptores del    neurotransmisor glutamato, (llamados receptores N-methyl-d-aspartato [NMDA]), que en el hipocampo    media la potencializaci&oacute;n a largo plazo, forma de neurotransmisi&oacute;n, importante en la    plasticidad sin&aacute;ptica y por ende en los procesos cognitivos. La disminuci&oacute;n de triglic&eacute;ridos mejora    el defecto cognitivo.<SUP>12</SUP> </font>     <P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El consumo elevado de grasas saturadas puede conducir a la afectaci&oacute;n del    funcionamiento del hipocampo, centro importante en la memoria y el    aprendizaje.<SUP>13</SUP> Se ha observado que en animales de experimentaci&oacute;n la ingesti&oacute;n de dietas hipercal&oacute;ricas (alta en grasa y    glucosa) presentan a los 8 meses impedimentos de la habilidad de aprendizaje, reducci&oacute;n de    las espinas de dendritas de las neuronas en el hipocampo y reducci&oacute;n de la potencializaci&oacute;n    a largo plazo en algunas sinapsis, adem&aacute;s de disminuci&oacute;n de los niveles del factor    neurotr&oacute;fico derivado del cerebro en el hipocampo. Concluyen que una dieta alta en calor&iacute;as reduce    la plasticidad sin&aacute;ptica y disminuye la capacidad    cognitiva.<SUP>14</SUP> </font>     <P ALIGN="left">    <br>   <font size="2" face="Verdana, Arial, Helvetica, sans-serif"><B>Resistencia a la insulina y diabetes mellitus de tipo 2</B></font>     <P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El obeso presenta resistencia a la acci&oacute;n de la insulina, por lo que debe producir mayor cantidad    para vencer esta resistencia. Se ha observado que la insulina influye en la memoria    (mejor&iacute;a, por favorecer la neuroplasticidad). El hipocampo es una regi&oacute;n del cerebro vulnerable a la resistencia a la    insulina. El descubrimiento de receptores a la insulina en el sistema nervioso central, la detecci&oacute;n de    insulina en el l&iacute;quido cefalorraqu&iacute;deo, despu&eacute;s de la administraci&oacute;n de insulina perif&eacute;rica, ha identificado    al cerebro como punto importante a la acci&oacute;n de la    insulina.<SUP>15</SUP> El cerebro, y en especial el    hipocampo, es una regi&oacute;n vulnerable a la resistencia a la    insulina.<SUP>16</SUP> &#191;Pudiera la resistencia a la acci&oacute;n de    la insulina, presente en la obesidad, tener un papel en la funci&oacute;n cognitiva de estos ni&ntilde;os? En    estudios realizados constatamos un  incremento significativo de la insulina plasm&aacute;tica en los obesos    (con antecedentes de diabetes mellitus de tipo 2 familiar y sin ellos) al compararlos con ni&ntilde;os de    peso normal.<SUP>17</SUP> </font>     <P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Las complicaciones de la llamada <I>diabesidad</I> (obesidad y diabetes) se extienden al sistema    nervioso central, incluyendo el hipocampo, una regi&oacute;n del cerebro que es vulnerable a la hiperglucemia y a    la insulina resistencia. El d&eacute;ficit en la plasticidad sin&aacute;ptica del hipocampo observada en la    diabetes tiene consecuencias negativas sobre la funci&oacute;n cognitiva. La diabesidad acelera el    envejecimiento cerebral y produce d&eacute;ficit    neurofisiol&oacute;gicos.<SUP>18,19</SUP> </font>     <P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La diabetes mellitus de tipo 2 est&aacute; caracterizada por una resistencia a la acci&oacute;n de la insulina,  que produce da&ntilde;o en las estructuras cerebrales y afecta la neuroplasticidad del hipocampo (&aacute;rea  importante del aprendizaje y la memoria). </font>     <P align="left">    <br>   <font size="2" face="Verdana, Arial, Helvetica, sans-serif"><B>Aumento de leptina (por resistencia a su acci&oacute;n)</B></font>     ]]></body>
<body><![CDATA[<P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La leptina es una citocina producida por el tejido adiposo. El aumento de leptina afecta la    producci&oacute;n de &oacute;xido n&iacute;trico (ON) en el endotelio vascular (el ON es vasodilatador). Las cifras elevadas    de leptina constituyen un factor para la disfunci&oacute;n    endotelial.<SUP>20</SUP> La leptina, posee m&uacute;ltiples    funciones, entre ellas la de disminuir el apetito y aumentar la termog&eacute;nesis. La leptina interviene en    la excitabilidad de la neurona y en la plasticidad sin&aacute;ptica. Regula el desarrollo y funci&oacute;n de    circuitos neuronales.<SUP>21</SUP> </font>     <P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El hipocampo es un &aacute;rea del cerebro involucrada en el aprendizaje y la memoria. La leptina    facilita la inducci&oacute;n de la plasticidad sin&aacute;ptica en esta &aacute;rea. El mecanismo que lo explica incluye la    facilitaci&oacute;n de la funci&oacute;n de los receptores del glutamato    (NMDA).<SUP>22</SUP> Se ha se&ntilde;alado que la    hipertrigliceridemia es responsable en parte de la resistencia a la leptina y que los triglic&eacute;ridos elevados inhiben    su transportaci&oacute;n a trav&eacute;s de la barrera    hematoencef&aacute;lica.<SUP>23 </SUP> En la obesidad existe resistencia a la    leptina. &#191;Pudiera esto explicar en parte las alteraciones cognitivas referidas en la obesidad? </font>     <P ALIGN="left">    <br>   <font size="2" face="Verdana, Arial, Helvetica, sans-serif"><B>Factor de necrosis tumoral </B></font>     <P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En la obesidad, el tejido adiposo aumenta la producci&oacute;n de factor de necrosis tumoral    (TNF-<font color="#000000">&alpha;</font>). Se plantea que esta citocina, adem&aacute;s de su efecto promotor de resistencia a la insulina, produce    depresi&oacute;n, ansiedad y disminuci&oacute;n de la    memoria.<SUP>24</SUP> </font>     <P ALIGN="left">    <br>   <font size="2" face="Verdana, Arial, Helvetica, sans-serif"><B>Hipertensi&oacute;n arterial</B></font>     <P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La mayor&iacute;a de los estudios longitudinales han demostrado que la funci&oacute;n cognitiva es    inversamente proporcional a los valores de tensi&oacute;n arterial (TA) medidos 15 a 20 a&ntilde;os previos. En los    pacientes con mayores cifras de TA se observ&oacute; peor funci&oacute;n    cognitiva.<SUP>25</SUP> </font>     <P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Se ha llamado la atenci&oacute;n sobre el posible efecto protector del tratamiento antihipertensivo    en favorecer la funci&oacute;n cognitiva en los hipertensos, as&iacute; como el tratamiento de la resistencia a    la insulina.<SUP>26-28</SUP> </font>     <P ALIGN="left">    ]]></body>
<body><![CDATA[<br>   <font size="2" face="Verdana, Arial, Helvetica, sans-serif"><B>Deficiencias de vitaminas antioxidantes</B></font>     <P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El bajo nivel socioecon&oacute;mico no s&oacute;lo lleva a la desnutrici&oacute;n con d&eacute;ficit de micronutrientes por    la disminuci&oacute;n en la ingesti&oacute;n de alimentos, sino tambi&eacute;n a la obesidad por el consumo    principalmente de alimentos a base de carbohidratos, los cuales son baratos pero no contienen los elementos    necesarios </font>     <P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">para una nutrici&oacute;n adecuada. Por consiguiente, se produce obesidad, con los efectos negativos  sobre la salud y el desempe&ntilde;o escolar. Tambi&eacute;n a veces se realiza una alimentaci&oacute;n deficiente  por desconocimiento de los aspectos fundamentales de una nutrici&oacute;n saludable. En ni&ntilde;os y  adolescentes obesos se han encontrado deficiencias de hierro, zinc, vitaminas B12, D, A y E, las cuales  pueden provocar deficiencia cognitiva y  motora.<SUP>29-39</SUP> </font>     <P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La deficiencia de vitaminas antioxidantes como la vitamina A y E en el paciente obeso, que de por    s&iacute; tiene un estr&eacute;s oxidativo importante, repercute en el funcionamiento adecuado del sistema    nervioso central. </font>     <P ALIGN="left">    <br>   <font size="2" face="Verdana, Arial, Helvetica, sans-serif"><B>Bajo peso al nacer</B></font>     <P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Es conocido que el bajo peso al nacer constituye un factor de riesgo futuro de enfermedades    cr&oacute;nicas no transmisibles, entre ellas la obesidad e    hipertensi&oacute;n<SUP>40, 41</SUP> y que en los ni&ntilde;os con bajo peso al    nacer aumenta la incidencia de trastornos cognitivos que han sido detectados en la edad    preescolar.<SUP>42</SUP> </font>     <P ALIGN="left">    <br>         <br>   <font size="3" face="Verdana, Arial, Helvetica, sans-serif"><B>CONCLUSIONES</B></font>     ]]></body>
<body><![CDATA[<P ALIGN="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La obesidad, adem&aacute;s de las se&ntilde;ales de aterosclerosis tempranas presentes en ni&ntilde;os y    adolescentes, tambi&eacute;n puede afectar  la esfera cognitiva, por diferentes v&iacute;as. Es importante que estos    aspectos sean del conocimiento del personal responsable de la atenci&oacute;n de estos ni&ntilde;os y adolescentes. </font>     <P ALIGN="left">    <br>         <br>   <font size="3" face="Verdana, Arial, Helvetica, sans-serif"><B>REFERENCIAS BIBLIOGR&Aacute;FICAS</B></font>     <!-- ref --><P align="left"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">1.    Ferrer M, Rodr&iacute;guez C, Gonz&aacute;lez MT D&iacute;az M, N&uacute;&ntilde;ez    M. Obesidad, hipertensi&oacute;n y tabaquismo: se&ntilde;ales ateroscler&oacute;ticas    tempranas en adolescentes de la secundaria b&aacute;sica &quot;Guido Fuentes&quot;.    Rev Cubana de Invest Biomed. 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<body><![CDATA[<br>         <br>   <font size="2" face="Verdana, Arial, Helvetica, sans-serif">Recibido: 4 de mayo de 2010.</font>         <br>   <font size="2" face="Verdana, Arial, Helvetica, sans-serif">Aprobado: 16 de agosto de 2010.</font>       <br>       <br>       <br>       <br>   <font size="2" face="Verdana, Arial, Helvetica, sans-serif"><I>Regino Pi&ntilde;ero Lamas.</I> Centro de Investigaci&oacute;n y Referencia de Aterosclerosis de la    Habana (Policl&iacute;nico 19 de Abril). Panorama y Tulip&aacute;n, Plaza. La Habana, Cuba. </font>       <br>   <font size="2" face="Verdana, Arial, Helvetica, sans-serif">Correo electr&oacute;nico: <a href="mailto:rpineiro@infomed.sld.cu">rpineiro@infomed.sld.cu</a></font>      ]]></body><back>
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