[Vitamin B12, fatty acids EPA and DHA during pregnancy and lactation in women with a plant-based diet]. / Vitamina B12, ácidos grasos EPA y DHA durante el embarazo y la lactancia en mujeres con alimentación basada en plantas.

Pregnancy and lactation represent a complex stage from a nutritional point of view, since energy, protein and micronutrient requirements increase during these stages. The literature describes that a well-planned plant-based diet can be sufficient in energy, macronutrients and micronutrients, with the exception of vitamin B12 and n3 polyunsaturated fatty acids, mainly EPA and DHA. During the last few years, adherence to this diet has increased rapidly in the population, so the main objective of this article is to review the current evidence on the intake and concentrations of vitamin B12, EPA and DHA during pregnancy and lactation in women following a plant-based diet. A literature search was performed in PubMed, Scopus, Web of Science and Ovid MedLine using free terms and MESH. Eleven articles were selected in this review. Well-planned vegetarian and vegan diets, with adequate supplementation of vitamin B12, EPA and DHA, are compatible during pregnancy and lactation, being a positive predictor of their content in breast milk. A similar situation was observed in plasma levels in women supplemented with B12. However, it is important to continue with research in this area that considers an adequate dietary anamnesis, integral evaluation of nutritional status, estimation of nutritional requirements and an individualized nutritional plan.

Dietary and Nutritional Interventions in Nonalcoholic Fatty Liver Disease in Pediatrics.

Nonalcoholic fatty liver disease (NAFLD) is pediatrics' most common chronic liver disease. The incidence is high in children and adolescents with obesity, which is associated with an increased risk of disease progression. Currently, there is no effective drug therapy in pediatrics; therefore, lifestyle interventions remain the first line of treatment. This review aims to present an updated compilation of the scientific evidence for treating this pathology, including lifestyle modifications, such as exercise and dietary changes, highlighting specific nutritional strategies. The bibliographic review was carried out in different databases, including studies within the pediatric population where dietary and/or nutritional interventions were used to treat NAFLD. Main interventions include diets low in carbohydrates, free sugars, fructose, and lipids, in addition to healthy eating patterns and possible nutritional interventions with n-3 polyunsaturated fatty acids (EPA and DHA), amino acids (cysteine, L-carnitine), cysteamine, vitamins, and probiotics (one strain or multi-strain). Lifestyle changes remain the main recommendation for children with NAFLD. Nevertheless, more studies are required to elucidate the effectiveness of specific nutrients and bioactive compounds in this population.

Linoleic and arachidonic fatty acids and their potential relationship with inflammation, pregnancy, and fetal development.

BACKGROUND: A healthy maternal diet must consider an appropriate supply of long-chain polyunsaturated fatty acids (LCPUFAs) precursors to ensure adequate growth and development of the fetus. In this regard, n-6 PUFAs, predominantly linoleic (C18:2 n-6, LA) and arachidonic acid (C20:4 n-6), have a central role in the development of the central nervous system because they are part of the membrane structure and participate in the metabolism and signal transduction of cells. Nevertheless, they can also be transformed into inflammatory metabolites promoting the pathogenesis of cardiovascular diseases, cancer, and autoimmune or inflammatory conditions. In modern westernized societies, there is a high dietary consumption of foods rich in n-6 PUFAs which could have detrimental consequences for the fetus and neonate due to excessive exposure to these fatty acids (FAs). OBJECTIVE: To summarize the evidence of maternal, placental, and fetal alterations that an excessive intake of n-6 polyunsaturated FAs (PUFAs), LA, and AA), could produce during pregnancy. METHODS: A thorough review of the literature regarding the effects of n-6 PUFAs during pregnancy and lactation including in vivo and in vitro models, was carried out using the PubMed database from the National Library of Medicine-National Institutes of Health. RESULTS: An elevated intake of n-6 PUFA, specifically LA, during pregnancy influences children's motor, cognitive, and verbal development during infancy and early childhood. Similarly, they could harm the placenta and the development of other fetal organs such as the fat tissue, liver, and cardiovascular system. CONCLUSION: Maternal diet, specifically LA intake, could have significant repercussions on fetal development and long-term consequences in the offspring, including the possibility of future metabolic and mental diseases. It would be necessary to focus on the prevention of these alterations through timely dietary interventions in the target population.

Efecto de la suplementación con omega-3 durante la gestación y la lactancia sobre la composición de ácidos grasos de la leche materna en los primeros meses de vida: una revisión narrativa / Effect of omega-3 supplementation during pregnancy and lactation on the fatty acid composition of breast milk in the first months of life: a narrative review

Los ácidos grasos poliinsaturados de cadena larga omega-3 son esenciales, por lo que deben aportarse a través de la dieta al ser su síntesis biológica limitada; por ello es imprescindible administrarlos para lograr cubrir los requerimientos durante los estadios fisiológicos como el embarazo y la lactancia. Se realizó una revisión narrativa de los efectos de la suplementación de omega-3 durante los periodos de embarazo y lactancia en la composición de ácidos grasos de la leche materna en los primeros meses de vida. En ella se analizaron siete estudios clínicos aleatorizados, de los que se obtuvo un aumento significativo de las concentraciones de ácido docosahexaenoico (DHA) en la leche materna (LM) después de la suplementación, en comparación con los grupos de control. Un estudio evaluó la dosis necesaria para alcanzar un 8 % de DHA en los eritrocitos y un 1 % de DHA en la LM, alcanzándose estos niveles con una suplementación cercana a 1 g de ácido docosahexaenoico + ácido eicosapentaenoico (EPA). Finalmente, se encontró un ensayo que utilizó la suplementación con pequeños aportes de lípidos (0,59 g de ácido α-linolénico (ALA)), sin generar cambios significativos en la composición de DHA de la LM pero sí en el contenido de ALA. Por lo tanto, se infiere que la suplementación con omega-3 modifica de forma beneficiosa los niveles de DHA y EPA en la composición de la LM en las mujeres embarazadas y durante la etapa de lactancia, aunque son necesarios más estudios para identificar las dosis, los tiempos, los efectos beneficiosos sobre el desarrollo y las formas de entrega más eficientes de la suplementación con omega-3. (AU)

Omega-3 long-chain, polyunsaturated fatty acids are essential, so they must be provided through the diet, as their biological synthesis is limited, making it essential to meet their requirements during physiological stages such as pregnancy and lactation. A narrative review was conducted on the effects of omega-3 supplementation during pregnancy and lactation on the fatty acid composition of breast milk in the first months of life. Seven randomized clinical studies were analyzed, showing a significant increase in docosahexaenoic acid (DHA) concentration in breast milk (BM) post-supplementation, compared to control groups. One study evaluated the dose needed to achieve 8 % DHA in erythrocytes and 1 % DHA in BM, reaching these levels with a supplementation close to 1 g of docosahexaenoic acid + eicosapentaenoic acid (EPA). Finally, a trial was found that used supplementation with small lipid contributions (0,59 g α-linolenic acid (ALA)), without generating significant changes in the DHA composition of LM, but in the ALA content. Therefore, it is inferred that omega-3 supplementation beneficially modifies DHA and EPA levels in the composition of BM in pregnant women and during the lactation stage, although further studies are needed to identify doses, times, beneficial effects on development, and more efficient forms of delivery of omega-3 supplementation. (AU)

[Effect of omega-3 supplementation during pregnancy and lactation on the fatty acid composition of breast milk in the first months of life: a narrative review]. / Efecto de la suplementación con omega-3 durante la gestación y la lactancia sobre la composición de ácidos grasos de la leche materna en los primeros meses de vida: una revisión narrativa.

INTRODUCTION: Omega-3 long-chain, polyunsaturated fatty acids are essential, so they must be provided through the diet, as their biological synthesis is limited, making it essential to meet their requirements during physiological stages such as pregnancy and lactation. A narrative review was conducted on the effects of omega-3 supplementation during pregnancy and lactation on the fatty acid composition of breast milk in the first months of life. Eight randomized clinical studies were analyzed, showing a significant increase in docosahexaenoic acid (DHA) concentration in breast milk (BM) post-supplementation, compared to control groups. One study evaluated the dose needed to achieve 8 % DHA in erythrocytes and 1 % DHA in BM, reaching these levels with a supplementation close to 1 g of docosahexaenoic acid + eicosapentaenoic acid (EPA). Finally, a trial was found that used supplementation with small lipid contributions (0,59 g α-linolenic acid (ALA)), without generating significant changes in the DHA composition of LM, but in the ALA content. Therefore, it is inferred that omega-3 supplementation beneficially modifies DHA and EPA levels in the composition of BM in pregnant women and during the lactation stage, although further studies are needed to identify doses, times, beneficial effects on development, and more efficient forms of delivery of omega-3 supplementation.

INTRODUCCIÓN: Los ácidos grasos poliinsaturados de cadena larga omega-3 son esenciales, por lo que deben aportarse a través de la dieta al ser su síntesis biológica limitada; por ello es imprescindible administrarlos para lograr cubrir los requerimientos durante los estadios fisiológicos como el embarazo y la lactancia. Se realizó una revisión narrativa de los efectos de la suplementación de omega-3 durante los periodos de embarazo y lactancia en la composición de ácidos grasos de la leche materna en los primeros meses de vida. En ella se analizaron ocho estudios clínicos aleatorizados, de los que se obtuvo un aumento significativo de las concentraciones de ácido docosahexaenoico (DHA) en la leche materna (LM) después de la suplementación, en comparación con los grupos de control. Un estudio evaluó la dosis necesaria para alcanzar un 8 % de DHA en los eritrocitos y un 1 % de DHA en la LM, alcanzándose estos niveles con una suplementación cercana a 1 g de ácido docosahexaenoico + ácido eicosapentaenoico (EPA). Finalmente, se encontró un ensayo que utilizó la suplementación con pequeños aportes de lípidos (0,59 g de ácido α-linolénico (ALA)), sin generar cambios significativos en la composición de DHA de la LM pero sí en el contenido de ALA. Por lo tanto, se infiere que la suplementación con omega-3 modifica de forma beneficiosa los niveles de DHA y EPA en la composición de la LM en las mujeres embarazadas y durante la etapa de lactancia, aunque son necesarios más estudios para identificar las dosis, los tiempos, los efectos beneficiosos sobre el desarrollo y las formas de entrega más eficientes de la suplementación con omega-3.

Impact of Maternal Obesity on the Metabolism and Bioavailability of Polyunsaturated Fatty Acids during Pregnancy and Breastfeeding.

Abstract: Prenatal and postnatal development are closely related to healthy maternal conditions that allow for the provision of all nutritional requirements to the offspring. In this regard, an appropriate supply of fatty acids (FA), mainly n-3 and n-6 long-chain polyunsaturated fatty acids (LCPUFA), is crucial to ensure a normal development, because they are an integral part of cell membranes and participate in the synthesis of bioactive molecules that regulate multiple signaling pathways. On the other hand, maternal obesity and excessive gestational weight gain affect FA supply to the fetus and neonate, altering placental nutrient transfer, as well as the production and composition of breast milk during lactation. In this regard, maternal obesity modifies FA profile, resulting in low n-3 and elevated n-6 PUFA levels in maternal and fetal circulation during pregnancy, as well as in breast milk during lactation. These modifications are associated with a pro-inflammatory state and oxidative stress with short and long-term consequences in different organs of the fetus and neonate, including in the liver, brain, skeletal muscle, and adipose tissue. Altogether, these changes confer to the offspring a higher risk of developing obesity and its complications, as well as neuropsychiatric disorders, asthma, and cancer. Considering the consequences of an abnormal FA supply to offspring induced by maternal obesity, we aimed to review the effects of obesity on the metabolism and bioavailability of FA during pregnancy and breastfeeding, with an emphasis on LCPUFA homeostasis.