<?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>0004-0622</journal-id>
<journal-title><![CDATA[Archivos Latinoamericanos de Nutrición]]></journal-title>
<abbrev-journal-title><![CDATA[ALAN]]></abbrev-journal-title>
<issn>0004-0622</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Latinoamericana de Nutrición]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0004-06222008000400001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Las dietas cetogénicas: beneficios adicionales a la pérdida de peso y efectos secundarios infundados]]></article-title>
<article-title xml:lang="en"><![CDATA[Ketogenic diets: additional benefits to the weight loss and unfounded secondary effects]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Guisado]]></surname>
<given-names><![CDATA[Joaquín]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Córdoba Facultad de Medicina Departamento de Medicina]]></institution>
<addr-line><![CDATA[Córdoba ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2008</year>
</pub-date>
<volume>58</volume>
<numero>4</numero>
<fpage>323</fpage>
<lpage>329</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_arttext&amp;pid=S0004-06222008000400001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_abstract&amp;pid=S0004-06222008000400001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_pdf&amp;pid=S0004-06222008000400001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Además de la pérdida de peso, también es importante enfatizar que las dietas cetogénicas son saludables cardiovascularmente y para el metabolismo glucídico, ya que promueven un perfil lipídico no aterogénico, el descenso de la presión arterial y disminuyen la resistencia a la insulina con una mejora en los niveles plasmáticos de glucosa e insulina. Estas dietas podrían tener efectos anticancerígenos, no tienen efectos perniciosos sobre el hígado o el riñón, no se asocian a acidosis metabólica, tienen muchas propiedades beneficiosas sobre el sistema nervioso central, no producen osteoporosis y podrían aumentar el rendimiento en la actividad deportiva de tipo aeróbico.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Ketogenic diets: additional benefits to the weight loss and unfounded secondary effects. It is also necessary to emphasise that as well as the weight loss, ketogenic diets are healthier because they promote a non-atherogenic lipid profile, lower blood pressure and diminish resistance to insulin with an improvement in blood levels of glucose and insulin. Such diets also have antineoplasic benefits, do not alter renal or liver functions, do not produce metabolic acidosis by Ketosis, have many neurological benefits in central nervous system, do not produce osteoporosis and could increase the perfomance in aerobic sports.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Atkins]]></kwd>
<kwd lng="es"><![CDATA[cáncer]]></kwd>
<kwd lng="es"><![CDATA[diabetes]]></kwd>
<kwd lng="es"><![CDATA[epilepsia]]></kwd>
<kwd lng="es"><![CDATA[intolerancia a la glucosa]]></kwd>
<kwd lng="es"><![CDATA[cetosis]]></kwd>
<kwd lng="en"><![CDATA[Atkins]]></kwd>
<kwd lng="en"><![CDATA[cancer]]></kwd>
<kwd lng="en"><![CDATA[diabetes]]></kwd>
<kwd lng="en"><![CDATA[epilepsy]]></kwd>
<kwd lng="en"><![CDATA[glucose intolerance]]></kwd>
<kwd lng="en"><![CDATA[ketosis]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"><font face="Verdana"><b>Las dietas cetogénicas: beneficios  adicionales a la pérdida de peso y efectos secundarios infundados</b></font></p>     <p align="center"><b><font face="Verdana" size="2">Joaquín Pérez-Guisado</font></b></p>     <p align="justify"><font face="Verdana" size="2">Departamento de Medicina,  Facultad de Medicina, Universidad de Córdoba, Córdoba. España</font></p> <font face="Verdana" size="2">     <p align="justify"><b>RESUMEN</b></p>     <p align="justify">Además de la pérdida de peso, también es importante enfatizar  que las dietas cetogénicas son saludables cardiovascularmente y para el  metabolismo glucídico, ya que promueven un perfil lipídico no aterogénico, el  descenso de la presión arterial y disminuyen la resistencia a la insulina con  una mejora en los niveles plasmáticos de glucosa e insulina. Estas dietas  podrían tener efectos anticancerígenos, no tienen efectos perniciosos sobre el  hígado o el riñón, no se asocian a acidosis metabólica, tienen muchas  propiedades beneficiosas sobre el sistema nervioso central, no producen  osteoporosis y podrían aumentar el rendimiento en la actividad deportiva de tipo  aeróbico.</p>     <p align="justify"><b>Palabras clave:</b> Atkins, cáncer, diabetes, epilepsia,  intolerancia a la glucosa, cetosis.</p>     <p align="center"><b>Ketogenic diets: additional benefits to the weight loss  and unfounded secondary effects</b></p>     <p align="justify"><b>SUMMARY</b></p>     <p align="justify">Ketogenic diets: additional benefits to the weight loss and  unfounded secondary effects. It is also necessary to emphasise that as well as  the weight loss, ketogenic diets are healthier because they promote a non-atherogenic  lipid profile, lower blood pressure and diminish resistance to insulin with an  improvement in blood levels of glucose and insulin. Such diets also have  antineoplasic benefits, do not alter renal or liver functions, do not produce  metabolic acidosis by Ketosis, have many neurological benefits in central  nervous system, do not produce osteoporosis and could increase the perfomance in  aerobic sports.</p>     <p align="justify"><b>Key words:</b> Atkins, cancer, diabetes, epilepsy, glucose  intolerance, ketosis.</p>     ]]></body>
<body><![CDATA[<p align="justify">Recibido: 21/07/2008 Aceptado: 27/10/2008</p>     <p align="justify"><b>Beneficios cardiovasculares de las dietas cetogénicas</b></p>     <p align="justify">En contra de lo que muchos científicos piensan, las dietas  cetogénicas producen una mejora en el perfil cardiovascular, induciendo un  efecto cardioprotector (1). Cuando se analizan los hábitos nutricionales de la  sociedad norteamericana, se observa que se ha producido un aumento en el consumo  de carbohidratos y que este patrón de consumo se ha asociado a la obesidad y al  aumento en los marcadores aterogénicos como son los triglicéridos o VLDL (2).  Para Dasthi y col. (3) el uso de una dieta cetogénica en pacientes obesos  durante un período de tiempo de 12 semanas, además de reducir el peso también  provocó una mejora en el perfil cardiovascular. Concretamente se produce un  descenso significativo en los niveles sanguíneos de triglicéridos tanto en  ayunas como tras las comidas (4) y ambos niveles se consideran factores  independientes de riesgo cardiovascular (5,6). Además, el hecho de que una dieta  rica en carbohidratos se asocie a hipertrigliceridemia está bien establecido  (2,7-9). Al comparar una dieta baja en carbohidratos con una dieta baja en  grasas, se puede comprobar que se produce un descenso en los niveles de  triglicéridos y un incremento en los niveles de HDL más marcado en la dieta baja  en carbohidratos que en la dieta baja en grasas, tanto a los seis meses (10)  como a los 12 meses (11) de seguimiento. Teniendo en cuenta que el perfil  aterogénico lipoproteico está caracterizado por un incremento en la producción  hepática de VLDL, bajos niveles de HDL y un predominio de moléculas LDL de  pequeño tamaño (12), resulta sorprendente que la dieta tradicional baja en  grasas y rica en carbohidratos favorezca este perfil aterogénico en pacientes  que previamente no tenían este problema (13). Las dietas bajas en carbohidratos  y ricas en grasas por el contrario, mejoran todos estos patrones aterogénicos,  descendiendo los niveles de triglicéridos en ayunas y postprandiales e  incrementando los niveles de HDL y partículas de gran tamaño de LDL. En relación  a los niveles de LDL, las dietas cetogénicas pueden incrementar las cifras  totales de dichas lipoproteínas, sin embargo hay que ser muy cautos a la hora de  interpretar este ascenso, ya que mejoran el perfil LDL, provocando un descenso  en las partículas de pequeño tamaño e incrementando las de gran tamaño, además  de provocar un descenso en el cociente colesterol total/HDL (4,14-16). Cuando la  dieta cetogénica se basa fundamentalmente en las proteínas, también tienen  beneficios cardiovasculares, de tal forma que provoca un descenso del colesterol  total, LDL, triglicéridos e incrementa los niveles de HDL (3,17-19). Comparando  la dieta cetogénica baja en carbohidratos/alta en proteínas con una dieta  cetogénica baja en carbohidratos/alta en grasas parece ser que la principal  diferencia entre ambas dietas desde un punto de vista de lípidos sanguíneos, se  refleja en los niveles de LDL. Así por ejemplo, en una dieta cetogénica rica en  grasas (60% de energía procedente de la grasa, 32% de la proteína y 8% de los  carbohidratos) los niveles totales de LDL aumentan (20), mientras que en una  dieta cetogénica alta en proteínas (31% de energía procedente de la grasa, 55%  de la proteína y 14% de los carbohidratos) disminuyen (21), aunque como ya se  dijo con anterioridad, los niveles que aumentan de LDL son los  cardiovascularmente saludables.</p>     <p align="justify">Las dietas cetogénicas bajas en carbohidratos no solamente  tienen beneficios cardiovasculares a corto plazo, sino también en periodos de  tiempo de más larga duración: así a los seis meses de seguimiento provocan  mejoras en la presión sanguínea, colesterol total, LDL, HDL y triglicéridos  (22,23); y a los 12 meses de duración su consumo se asocia a una mayor mejora en  factores de riesgo cardiovasculares si se compara con una dieta baja en grasas,  ya que los niveles de HDL son mayores y los triglicéridos menores (11,24).</p>     <p align="justify">En relación a los beneficios cardiovasculares, estas dietas  también demuestran ser efectivas para la hipertensión. Esta eficacia podría ser  debida a que las dietas bajas en carbohidratos corrigen anormalidades del  metabolismo de la glucosa descendiendo la presión sanguínea y los niveles de  glucosa e insulina (25,26). Esta conexión se basa en el hecho de que la insulina  juega un papel importante en la regulación de la presión sanguínea, ya que los  niveles de insulina son la principal causa de hipertensión asociada a la  obesidad (26,27). Esto es debido a que la hiperinsulinemia produce  antinatriuresis, antikaliuresis y antiuricosuria (28). Por esta razón no nos  debe sorprender que la resistencia a la insulina esté vinculada con la  hipertensión (26,29). Otra causa parece estar relacionada con la asociación  inversa existente entre niveles altos de proteínas y presión sanguínea, ya que  una mayor ingesta en proteínas se asocia a presiones sanguíneas más bajas  (30,31). Esto podría ser consecuencia de la relación existente entre la mayor  pérdida de líquidos asociada a una mayor producción y eliminación de urea,  debido a que la urea proviene del metabolismo proteico y los riñones para  eliminarla necesitan una gran cantidad de agua, que se perderá con ella (32).</p>     <p align="justify">A todo lo anteriormente señalado, hay que añadir que la  cardiopatía hipertrófica hipertensiva, se podría prevenir en parte mediante el  empleo de dietas cetogénicas ricas en grasas gracias a los bajos niveles de  insulina e IGF-1 asociados, ya que estas hormonas anabólicas están implicadas en  la activación de los mecanismos moleculares responsables del desarrollo de dicha  hipertrofia (33).</p>     <p align="justify"><b>Beneficios en la prevención y tratamiento de la diabetes  tipo II</b></p>     <p align="justify">Las dietas cetogénicas también tienen beneficios en la  prevención y tratamiento de la diabetes tipo II ya que mejoran el perfil  glucémico (3,17,34-36) , la sensibilidad a la insulina y los niveles plasmáticos  de hemoglobina A1c (34-36). Por este motivo, estas dietas deberían de ser  consideradas no sólo por su perfil cardiovascular saludable, sino también como  terapia preventiva de la diabetes tipo II en personas con intolerancia a la  glucosa. Volek y col. (37) observaron en mujeres obesas que en comparación con  una dieta baja en grasas, la dieta cetogénica baja en carbohidratos era más  efectiva no sólo para la pérdida de peso, sino también para mejorar los niveles  plasmáticos de glucosa e insulina y la resistencia insulínica (37). Otros  autores, también han demostrado que el empleo de una dieta cetogénica, además de  reducir el peso (17,18,23,25) y la tensión arterial (23,25), corrige el  metabolismo de la glucosa, ya que desciende los niveles circulantes de glucosa  (17,18,23,25) e insulina (23,25), siendo un tratamiento efectivo en pacientes  obesos diabéticos tipo II (17). Por su parte, Bisschop y col. (38) comparando  los efectos de 3 tipos de dietas (A: 85% de carbohidratos y 0% de grasa; B:4% de  carbohidratos y 41% de grasa; C: 83% de grasa y 2% de carbohidratos) observaron  que la dieta cetogénica (dieta C) era capaz de provocar un cambio metabólico, de  glucolítico a lipolítico, de tal forma que la principal fuente de energía pasaba  de ser la grasa en lugar de la glucosa. Los autores explicaron que en la  diabetes tipo II, la resistencia a la insulina provocaría una incapacidad para  descender los niveles de glucosa debido a una inhibición en la captación de  glucosa por las células y en la síntesis del glucógeno. La dieta cetogénica  favorecería una mejora en la sensibilidad hacia la insulina, con una mayor  activación en la glucogenogénesis y por lo tanto con la consiguiente retirada de  glucosa de la sangre (38). En dicho entresijo metabólico, la hipoglucemia se  evitaría mediante un estímulo de la neogluconeogénesis. Bisschop y col. (38)  también recalcan que aunque el metabolismo lipolítico también se presenta con el  ayuno, hay una diferencia muy importante con el provocado por la dieta  cetogénica, pues mientras que el provocado por dicha dieta no causa  insulinorresistencia sino todo lo contrario, favoreciendo la síntesis del  glucógeno, el provocado por el ayuno provoca insulinorresistencia y no favorece  la síntesis de glucógeno.</p>     <p align="justify">Dashti y col (17) y Yancy y col. (39) examinaron la seguridad  y efectividad de una dieta cetogénica en la mejora del perfil glucémico en  pacientes obesos con diabetes tipo II (69 pacientes en el primer caso y 28 en el  segundo). En ambos casos hubo una mejora en la pérdida de peso, perfil lipídico  y glucémico. Yancy y col. (39) observaron que después de 16 semanas de  tratamiento, el 100% de pacientes que completaron el estudio tuvieron una mejora  significativa en el control glucémico (descendió la glucosa en ayunas y la HbA1c),  niveles de triglicéridos y pérdida de peso. La medicación para la diabetes que  tomaban estos pacientes fue interrumpida o reducida en el 68.42% de los  pacientes que completaron el estudio.</p>     <p align="justify">En relación a la resistencia insulínica se vincula el  síndrome del ovario poliquístico, un desorden metabólico frecuente en mujeres  que se encuentran en la edad reproductiva y que se caracteriza por  insulinorresistencia, obesidad central y dislipemia. Westman y col. (40) y  Mavropoulos y col. (41) estudiaron los efectos de una dieta cetogénica en el  síndrome del ovario poliquístico. Después de 24 semanas de seguimiento, la dieta  cetogénica mejoró significativamente el peso de las participantes, el porcentaje  de testosterona libre (40,41), la relación LH/FSH y la insulina en ayunas (41).  Estos resultados indican los posibles beneficios de las dietas cetogénicas en  mujeres con síndrome del ovario poliquístico.</p>     ]]></body>
<body><![CDATA[<p align="justify">Otra posible utilidad de las dietas cetogénicas vinculada al  metabolismo glucídico, parece estar relacionada con la diabetes gestacional, ya  que se ha comprobado que la reducción en la ingesta de carbohidratos en mujeres  que desarrollan este problema, trae como consecuencia una mejora en el perfil  glucémico y un descenso en las necesidades de insulina (42).</p>     <p align="justify"><b>Efectos infundados de las dietas cetogénicas ¿Posibles  efectos cancerígenos a largo plazo?</b></p>     <p align="justify">Muchos científicos piensan que las dietas más saludables  deberían de contener un 55-70% de carbohidratos y que las dietas cetogénicas  podrían ser potencialmente cancerosas debido a que existen estudios  epidemiológicos que han asociado la ingesta de productos animales con la génesis  del cáncer. Sin embargo, estos estudios están sesgados pues no tienen en cuenta  el posible efecto de factores de confusión cuya presencia si se ha demostrado  que se vincula al desarrollo del cáncer. Estos factores de confusión se  relacionan con una dieta rica en carbohidratos y son: la contribución energética  total de los carbohidratos, el índice glucémico, la carga glucémica, la glucemia  e insulinemia en ayunas y tras una carga oral de glucosa (43).</p>     <p align="justify">Por el contrario, las dietas cetogénicas han demostrado ser  eficientes en la reducción del tamaño tumoral y la perdida de peso asociada al  proceso canceroso, tanto en humanos (44,45) como en ratones (46). Esta capacidad  podría ser debida a una inhibición de la angiogénesis (47, 48) y una menor  disponibilidad de glucosa por parte del tumor (45, 48).</p>     <p align="justify"><b>¿Posibles efectos renales y hepáticos?</b></p>     <p align="justify">Las dietas bajas en carbohidratos no producen alteraciones  renales (49-52) ni hepáticas (49-51). Esto es debido a que se trata de un  proceso al que estamos fisiológicamente adaptados y que sólo podrá ser afectado  por alteraciones o enfermedades que hayan deteriorado previamente la correcta  función hepática o renal. Por ello, no nos debe de extrañar que las personas que  tengan una correcta función renal puedan tomar dietas altas en proteínas debido  a su inocuidad sobre el riñón normofuncionante (53-54).</p>     <p align="justify"><b>¿Las dietas cetogénicas se asocian a acidosis metabólica?</b></p>     <p align="justify">En primer lugar lo primero que hay que dejar claro es que  cetosis no es sinónimo de cetoacidosis y que las dietas cetogénicas se asocian a  cetosis pero no a cetoacidosis (55) debido a que al tratarse de un proceso  fisiológico, únicamente hay una ligera acidosis metabólica compensada sin  trastorno metabólico asociado (56). La cetoacidosis se da en procesos  patológicos como son la diabetes mellitus y el ayuno prolongado (57), es decir,  en situaciones en las que o no hay insulina o ésta es inefectiva. Este proceso  no se produce en las dietas cetogénicas debido a que los aminoácidos que se  ingieren y las hormonas gastrointestinales que se liberan durante el proceso de  ingestión, provocan la liberación de una cantidad de insulina que es escasa pero  necesaria para evitar la acumulación de grasa y suficiente para evitar la  aparición de situaciones patológicas derivadas de una ausencia total de efecto  insulínico, promoviéndose así la pérdida de grasa y la mejora de la sensibilidad  insulínica (57).</p>     <p align="justify">No obstante, en personas con obesidad mórbida y posibles  alteraciones metabólicas asociadas, sería posible que se produjera cetoacidosis,  como lo demuestra el caso clínico reportado por Chen y col. (58), que es la  única situación de cetoacidosis reportada en la literatura científica  relacionada con el seguimiento de una dieta cetogénica. Por ello, sería  conveniente que esta dieta fuera controlada por un médico.</p>     <p align="justify"><b>¿Las dietas cetogénicas son malas para nuestro sistema  nervioso?</b></p>     ]]></body>
<body><![CDATA[<p align="justify">La dieta cetogénica ha sido pilar de la alimentación en  muchos pueblos o tribus, como los esquimales, ya que la cetosis se trata de una  situación fisiológica (59,60).</p>     <p align="justify">Cuando una persona ingiere una dieta cetogénica o está en  ayuno, el organismo es capaz de adaptarse y pasar de un metabolismo glucolítico  a uno lipolítico, en el que la grasa pasa a ser la principal fuente energética.  En este proceso de adaptación, incluso las neuronas cerebrales que son células  que suelen obtener la energía en forma de glucosa, son capaces de adaptarse y  obtener de la grasa entre el 50 y 75% de la energía necesaria, concretamente de  los cuerpos cetónicos procedentes de la misma (61) ya que el cerebro no puede  consumir los ácidos grasos pero sí los cuerpos cetónicos (62). Por este motivo,  las personas que siguen este tipo de dietas, sólo acusan la falta de glucosa en  el periodo de adaptación que no suele prolongarse más de 48-72h, en el que  suelen mostrar irritabilidad, cansancio y sensación de hambre, ya que cuando su  metabolismo se vuelve lipolítico la sensación que experimentan suele ser de  plenitud energética y ausencia de hambre. Además, la cetosis ha demostrado ser  protectora del daño cerebral producido por situaciones de hipoxia (63) y  sustancias tóxicas como los radicales libres MPP derivados de la meperidina  (64), que producen una forma neurológica de parkinsonismo (65). A esto podemos  añadir la indudable efectividad y buena tolerancia que tiene esta dieta en el  tratamiento de la epilepsia infantil (66-73), de los adolescentes (74) y muy  probablemente de los adultos (75). Incluso pudiera ser de utilidad en el  tratamiento de la enfermedad de Alzheimer y otros procesos neurodegenerativos,  debido a la capacidad que tienen los cuerpos cetónicos para aumentar la  eficiencia energética de la mitocondria y porque éstos suponen un combustible  alternativo a la glucosa (76).</p>     <p align="justify"><b>¿Las dietas cetogénicas son perjudiciales para el hueso?</b></p>     <p align="justify">Un inconveniente que se les ha atribuido a las dietas altas  en proteínas es su posible efecto negativo sobre el metabolismo del calcio y por  lo tanto sobre la densidad ósea. Sobre el tema hay estudios que afirman todo lo  contrario: que el consumo de dietas ricas en proteínas no afectan negativamente  a la densidad ósea (77,78), que el consumo de dietas bajas en proteínas tiene un  impacto negativo sobre la densidad mineral en personas ancianas (77) y que el  incremento en la ingesta proteica animal en ancianos a 1.55 g/kg/día tiene un  efecto beneficioso sobre la masa ósea (79). Además, no se ha establecido  asociación entre el consumo de proteínas/fósforo y deficiencia en la absorción  del calcio (80) y se ha determinado que en dietas con un muy alto consumo  proteico el posible desequilibrio a favor del fósforo podría ser corregido  consumiendo 20 mg de calcio por gramo de proteína consumida (81). En cualquier  caso parece ser que en personas sin pérdida de masa ósea, se produce adaptación  a un amplio rango en la ingesta de calcio, de tal forma que la masa ósea se  mantiene mediante un equilibrio entre la formación ósea y la resorción (82).</p>     <p align="justify"><b>¿Está contraindicada la práctica deportiva con las dietas  cetogénicas?</b></p>     <p align="justify">El empleo de dietas cetogénicas no implica una limitación en  la actividad física normal de una persona, tanto sedentaria como deportista.  Esto no quiere decir que en aquellas personas obesas que se plantean perder  peso, la mejor combinación sea la de empezar una dieta cetogénica a la misma vez  que se inician en la práctica deportiva. En este caso sería mucho más prudente  que la persona se habituara primero a dicha dieta, para luego ir incrementando  progresivamente la actividad deportiva en relación a su peso, ya que como bien  sabemos la actividad física es una herramienta útil para disminuir la obesidad o  sobrepeso (83).</p>     <p align="justify">Con respecto a deportistas de competición, se debería de  considerar que tras la adaptación metabólica, su rendimiento podría incluso  incrementarse si se trata de actividades deportivas predominantemente aeróbicas  (en las que predomina el metabolismo lipolítico), como el ciclismo, ya que el  organismo está más adaptado para utilizar la grasa como combustible (84); pero  que en actividades de alto componente anaeróbico (en las que el metabolismo es  glucolítico), como el levantamiento de pesas o las carreras de velocidad, el  rendimiento se podría ver reducido (85).</p>     <p align="justify"><b>¿El hecho de consumir una dieta cetogénica muy rica en  proteínas irá asociado a una ganancia importante de masa muscular?</b></p>     <p align="justify">Las dietas cetogénicas tienen un efecto anticatabólico (60) y  cuando se realiza una dieta cetogénica rica en proteínas, es frecuente observar  en la práctica clínica con personas que tenían un balance nitrogenado negativo  con su dieta anterior, un ligero aumento de peso como consecuencia del  restablecimiento de los depósitos proteicos, ya que son capaces de mejorar la  composición corporal, reduciendo la grasa e incrementando la masa muscular (60).  Sin embargo, a pesar de su efecto anticatabólico, carecen de un efecto anabólico  “per se” que vaya más allá de esta mejora en la composición corporal, debido a  que en la ganancia de masa muscular resulta crucial la insulina y la relación  entre el porcentaje calórico total y el procedente del consumo proteico, de tal  forma que cuando el porcentaje calórico de las proteínas ingeridas supera el  umbral del 15-20%, la proteína pierde su efecto anabólico (86).</p>     <p align="justify"><b>¿Las dietas cetogénicas tienen un efecto oxidante o  antioxidante?</b></p>     ]]></body>
<body><![CDATA[<p align="justify">Otro beneficio presente en las dietas cetogénicas, es su  capacidad para aumentar el poder antioxidante del organismo, debido a que los  cuerpos cetónicos favorecen un estado antioxidante en las mitocondrias, por  activación de la glutatión peroxidasa, con el consiguiente incremento en la  síntesis de glutatión mitocondrial (87). Su capacidad antioxidante les permite  inhibir la formación de las temidas especies reactivas del oxígeno (ROS) y la  lipoperoxidación, teniendo como consecuencia final una reducción en la muerte  celular (88).</p>     <p align="justify"><b>REFERENCIAS</b></p>     <!-- ref --><p align="justify">1. Al-Zaid NS, Dashti HM, Mathew TC, Juggi JS. Low  carbohydrate ketogenic diet enhances cardiac tolerance to global ischaemia. 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