A Multi-Component Educational Intervention for Addressing Levels of Physical Activity and Sedentary Behaviors of Schoolchildren.

Physical inactivity and a sedentary lifestyle are risk factors for excess weight and obesity in childhood. It is, therefore, necessary to adopt strategies which can modify these behaviors during childhood, the age at which habits are formed. This study aimed to evaluate the impact of an educational intervention using digital media and face-to-face activities involving children, parents, and the school community on the level of physical activity and sedentary behavior among schoolchildren. This was a secondary analysis of data obtained from a community trial in which students from four primary schools in Mexico City participated. Two schools were assigned to the intervention group (IG) and two to the control group (CG). The intervention lasted 12 months and included a face-to-face component, which involved sessions and workshops for parents and children, as well as visual material for children and a distance component utilizing electronic means (web portal and text messages to mobile phones) for parents. Anthropometric measurements were taken and information was collected on moderate to vigorous physical activity performed by the children and on the time that the schoolchildren spent in front of screens at the beginning of the study and at 6 and 12 months. Information on 201 children from the IG and 167 children from the CG was included in the analysis. At 12 months, the IG showed a mean decrease of 33.4 min/d [95% CI: -53.5 to -13.3] in screen time, while the CG showed an increase of 12.5 min/d [CI 95%: -10.5 to 35.6], p = 0.003. After 12 months of follow-up, applying this educational intervention reduced the time that schoolchildren spent in front of screens. Educational intervention is a feasible and accessible strategy for promoting changes in sedentary behaviors in the school-age population.

Evidence of Unhealthy Dietary Patterns in the School Lunch Sent from Home for Children in Mexico City.

The identification and characterization of dietary patterns are tools that are used to assess associations between diet and health or disease conditions. In Mexico, studies have examined dietary patterns in children for breakfast or for the whole day, but not specifically for their school lunch. The aim was to describe dietary patterns identified in school lunch and their association with the nutritional status and metabolic parameters of schoolchildren. In this cross-sectional study on schoolchildren from four elementary schools of Mexico City, we recorded anthropometry measurements, a fasting blood sample was collected, and metabolic parameters were determined. We obtained information on the foods and beverages that children brought for their school lunch; estimated the caloric and nutritional content; and created food groups to obtain dietary patterns from the energy provided by those groups. Among the 350 schoolchildren (mean age, 7.9 ± 1.2 years) included, 24.9% and 21.7% presented having overweight and obesity, respectively. A total of 89.4% of schoolchildren brought the school lunch from home. Using the K-means method, the following four dietary patterns were identified: (1) sandwiches, tortas, and sweetened dairy products were consumed by 13.1% (n = 46) of the schoolchildren; (2) sweet snacks were consumed by 50.3% (n = 176); (3) sweetened dairy products were brought by 15.1% of the children (n = 53); and (4) sandwiches and tortas were brought by 21.4% (n = 75). These four patterns showed significant differences in terms of the caloric and nutritional contents (p < 0.001). Energy sources in the identified patterns were primarily sugars (15.8-40%). No association was found between the anthropometric and metabolic parameters of children and the dietary patterns. No dietary pattern obtained from the school lunch could be considered as healthy, since all of them had high energy content, and a high percentage of the energy was from sugars from ultra-processed foods and beverages.

Nutritional Characteristics, Sites of Origin, and Cost of Foods Consumed during School Hours and Their Relationship to Nutritional Status of Schoolchildren in Mexico City.

Access, nutritional characteristics, preferences, and cost can affect food intake at school. A cross-sectional study was performed to determine the nutritional characteristics, sites of origin, and cost of foods consumed during school hours. Three hundred and sixty-nine children from five public elementary schools in Mexico City participated. The children gave information about the foods that they consumed five days out of the week during school hours, including the place of acquisition, cost of the food, and portion size. Anthropometric measurements of height and weight of the children were taken. Caloric consumption and percentage of recommended daily energy intake from food during school hours was determined. Children were 10.9 ± 0.9 years old; 55.6% were girls, 26% were overweight, 23% were obese, and 3.3% were of low height for age. The average calorie intake was 515 kilocalories (kcal) (boys, 535 kcal; girls, 476 kcal, p = 0.051); calorie intake was higher when school meal intakes included foods from home, school, and outside of school. No significant differences were found in calorie intake by children's nutritional status. The cost in Mexican pesos per 100 kcal consumed showed differences according to the nutritional status of the children; it was 4.0 Mexican pesos for children with normal weight and 4.2 and 3.8 pesos in children who were overweight or obese, respectively. The information obtained in this study should be used to provide nutritional guidance. The food portion size intake during school hours should be reduced, and the food should come from one or at most two sites, because each extra food represents an increase in the total kilocalorie intake.

Cut-off points for serum ferritin to identify low iron stores during the first year of life in a cohort of Mexican infants.

The aim of this study was to identify serum ferritin (SF) cut-off points (COPs) in a cohort of healthy full-term normal birth weight infants who had repeated measurements of SF and haemoglobin every 3 months during the first year of life. The study included 746 full-term infants with birth weight ≥2,500 g, having uncomplicated gestations and births. Participants received prophylactic iron supplementation (1 mg/day of iron element) from the first to the 12th month of life and did not develop anaemia during the first year of life. Two statistical methods were considered to identify COPs for low iron stores at 3, 6, 9 and 12 months of age: deviation from mean and cluster analysis. According to the K-means cluster analysis results by age and sex, COPs at 3 and 6 months for girls were 39 and 21 µg/L and for boys 23 and 11 µg/L, respectively. A single COP of 10 µg/L was identified, for girls and boys, at both 9 and 12 months. Given the physiological changes in SF concentration during the first year of life, our study identified dynamic COPs, which differed by sex in the first semester. Adequate SF COPs are necessary to identify low iron stores at an early stage of iron deficiency, which represents one of the most widespread public health problems around the world, particularly in low- and middle-income countries.

Impact of a Nutrition-Related Community Intervention on the Quantity and Quality of Children's School almuerzo.

Foods and beverages that schoolchildren carry in their lunchboxes have high energy values but lack plain water, fresh fruits and vegetables. A nutrition-related community intervention on the quantity and quality of school almuerzo was performed, in which four primary schools participated, as part of two groups: 225 children in the intervention group (IG) and 177 children in the control group (CG). The parents from the IG had access to a website where they could consult information on eating habits and physical activity or school almuerzo menus. They were sent weekly text messages on their mobile phones and attended in-person sessions. Anthropometric measurements and surveys were performed in both groups at the start of the study, as well as after 6 and 12 months. The school almuerzo was assessed by recording foods that the children brought in their lunchboxes. At baseline, 88% of children brought a school almuerzo, 37% fruit, 17% vegetables, 40% plain water and 50% sweet drinks. In both groups, 50% of children brought a school almuerzo with an energy value above the recommended value (>340 kcal) during follow-up; however, the percentage of children who brought sweet drinks decreased (p < 0.05), with sweet drinks contributing between 26% and 33% of the calories in the school almuerzo. In the IG, the quantity in milliliters of plain water increased at the end of the follow-up period (p = 0.044). From the point of view of food-and-beverage quantity and quality, school almuerzo were unhealthy for both groups. The intervention failed to increase the frequency with which parents provided children with school almuerzo or enhance the quality of the latter.

Hepcidin and other indicators of iron status, by alpha-1 acid glycoprotein levels, in a cohort of Mexican infants.

The purpose of this study was to describe the changes in iron status indicators at 6 and 12 months of age, controlling by inflammation by measuring alpha-1 acid glycoprotein (AGP). This longitudinal study included 48 healthy-term singleton infants with birth weight ≥ 2500 g, born in hospitals of the Mexican Institute for Social Security. Complete blood count, ferritin, soluble transferrin receptor (sTfR), hepcidin, and AGP were measured in blood at 6 and 12 months of age. sTfR/ferritin ratio and total body iron (TBI) stores were calculated. Hemoglobin and sTfR/ferritin ratio increased with age, while ferritin and TBI decreased. In infants without inflammation, hepcidin, sTfR, and MVC did not show significant changes from 6 to 12 months of age, while ferritin and TBI decreased. In infants with inflammation, hepcidin, TBI, and ferritin levels increased, while hemoglobin and sTfR/ferritin ratio decreased. MVC and sTfR did not change significantly in the presence or absence of inflammation. Hepcidin concentration correlated positively and significantly with ferritin and TBI stores and showed significant negative correlation with sTfR/ferritin ratio. Our study showed that, in absence of inflammation and ID, during the first year of life, physiological changes occur in hemoglobin and ferritin levels as well as in indicators derived from ferritin and sTfR; in contrast, hepcidin and sTfR did not show significant change. However, hepcidin concentration was lower in infants with ID and was higher when inflammation was present, supporting that infants have a functional hepcidin response to changes in iron stores.

Childhood obesity in Mexico: A critical analysis of the environmental factors, behaviours and discourses contributing to the epidemic.

Mexico has the highest prevalence globally for children who are overweight. We conducted a qualitative study to understand childhood obesity in Mexico and the complex factors at play. Data were collected at three elementary schools in a low socio-economic area in Mexico City. Semi-structured interviews were conducted with 60 children, 24 parents and 28 teachers. The children interviewed were between the ages of 8 and 12 years old. Interview texts were analysed using NVivo 9 and 10 and thematic discourse analysis was used. Findings revealed how children's choices around nutrition and physical activity were constrained by their environment and discursive constructions.

Energy imbalance and psychosocial imbalance in the construction of child obesity in a marginalized area of Mexico City / Desbalance energético y desbalance psicosocial en la construcción de la obesidad infantil en una zona marginada de la Ciudad de México

Abstract Introduction Child obesity is a growing phenomenon and marginalized communities in Mexico City are not exempt from it. The results achieved by frequent preventive and remedial interventions are still unacceptable. Objective To contribute to the understanding of the growing problem of child obesity and overweight through a community health approach capable of transcending the biological perspective in order to improve interventions. Method We observed and interviewed a sample of school children, some overweight, some obese, and some with a normal BMI. All observations and interviews were carried out in the children's daily environment. We also interviewed some of their mothers. Together with our field notes, we analyzed these testimonies to construct the Grounded Theory that is the output of the present study. Results We found the children and their families immersed in a toxic environment that, through several mechanisms, fosters the consumption of high-density foods and discourages physical activity. We also found that the resources and competencies that families could use to fend off this environment are, at present, very limited. Discussion and conclusion We concluded that the energy imbalance in overweight and obese children's bodies corresponds to an abysmal psychosocial imbalance between the forces that foster obesity and the resources of the families affected by it. Any intervention aimed at preventing obesity must take this psychosocial imbalance into account.

Resumen Introducción La obesidad infantil es un fenómeno creciente del cual no quedan exentas las comunidades marginales de la Ciudad de México. Las intervenciones preventivas y remediales son frecuentes, pero sus impactos todavía no son aceptables. Objetivo Contribuir a la comprensión del fenómeno creciente de la obesidad y el sobrepeso infantil con una visión de salud comunitaria, que trascienda la visión biológica del problema y mejore las intervenciones. Método En su entorno escolar y comunitario observamos y entrevistamos a escolares, unos con obesidad o sobrepeso y otros con índice de masa corporal normal. También entrevistamos a las madres de algunos de ellos. Analizamos estos testimonios y nuestras notas de campo para construir la Teoría Fundamentada producto de este estudio. Resultados Encontramos a los niños y sus familias inmersos en un ambiente tóxico que, por múltiples mecanismos, promueve el consumo de alimentos de alta densidad e inhibe la actividad física. Encontramos también que los recursos y habilidades con que las familias podrían resistir a este ambiente son, por lo pronto, muy reducidos. Discusión y conclusión Concluimos que el desbalance energético en el cuerpo de los niños con sobrepeso corresponde a un enorme desbalance psicosocial entre las fuerzas que promueven la obesidad y los recursos de las familias que la sufren. Toda intervención preventiva debe tomar en cuenta este desequilibrio psicosocial.

Feasibility and impact of Creciendo Sanos, a clinic-based pilot intervention to prevent obesity among preschool children in Mexico City.

BACKGROUND: Mexico has the highest adult overweight and obesity prevalence in the Americas; 23.8% of children <5 years old are at risk for overweight and 9.7% are already overweight or obese. Creciendo Sanos was a pilot intervention to prevent obesity among preschoolers in Instituto Mexicano del Seguro Social (IMSS) clinics. METHODS: We randomized 4 IMSS primary care clinics to either 6 weekly educational sessions promoting healthful nutrition and physical activity or usual care. We recruited 306 parent-child pairs: 168 intervention, 138 usual care. Children were 2-5 years old with WHO body mass index (BMI) z-score 0-3. We measured children's height and weight and parents reported children's diet and physical activity at baseline and 3 and 6-month follow-up. We analyzed behavioral and BMI outcomes with generalized mixed models incorporating multiple imputation for missing values. RESULTS: 93 (55%) intervention and 96 (70%) usual care families completed 3 and 6-month follow-up. At 3 months, intervention v. usual care children increased vegetables by 6.3 servings/week (95% CI, 1.8, 10.8). In stratified analyses, intervention participants with high program adherence (5-6 sessions) decreased snacks and screen time and increased vegetables v. usual care. No further effects on behavioral outcomes or BMI were observed. Transportation time and expenses were barriers to adherence. 90% of parents who completed the post-intervention survey were satisfied with the program. CONCLUSIONS: Although satisfaction was high among participants, barriers to participation and retention included transportation cost and time. In intention to treat analyses, we found intervention effects on vegetable intake, but not other behaviors or BMI. TRIAL REGISTRATION: ClinicalTrials.gov NCT01539070.Comisión Nacional de Investigación Científica del IMSS: 2009-785-120.

A contrast between mothers' assessments of child malnutrition and physical anthropometry in rural Mexico: a mixed methods community study.

OBJECTIVE: To compare mothers' assessments of nutritional status with anthropometric measures and gain further insights into mothers' reasons for their judgment. DESIGN: Each mother was asked to assess the nutritional status of her child and 2 other children and to compare all 3. Rates for "hits" and "misses" between mothers' assessment and physical anthropometry were analyzed using the binomial test. The rationale for the mothers' assessments was explored through open-ended questions. SETTING: A rural clinic in an indigenous area of Mexico. PARTICIPANTS: 31 mothers of children 1-5 years of age. MAIN OUTCOME MEASURES: Physical anthropometry and mothers' assessments. RESULTS: A significant proportion (P

Prevalence of anemia and deficiency of iron, folic acid, and zinc in children younger than 2 years of age who use the health services provided by the Mexican Social Security Institute.

BACKGROUND: In Mexico, as in other developing countries, micronutrient deficiencies are common in infants between 6 and 24 months of age and are an important public health problem. The objective of this study was to determine the prevalence of anemia and of iron, folic acid, and zinc deficiencies in Mexican children under 2 years of age who use the health care services provided by the Mexican Institute for Social Security (IMSS). METHODS: A nationwide survey was conducted with a representative sample of children younger than 2 years of age, beneficiaries, and users of health care services provided by IMSS through its regular regimen (located in urban populations) and its Oportunidades program (services offered in rural areas). A subsample of 4,955 clinically healthy children was studied to determine their micronutrient status. A venous blood sample was drawn to determine hemoglobin, serum ferritin, percent of transferrin saturation, zinc, and folic acid. Descriptive statistics include point estimates and 95% confidence intervals for the sample and projections for the larger population from which the sample was drawn. RESULTS: Twenty percent of children younger than 2 years of age had anemia, and 27.8% (rural) to 32.6% (urban) had iron deficiency; more than 50% of anemia was not associated with low ferritin concentrations. Iron stores were more depleted as age increased. Low serum zinc and folic acid deficiencies were 28% and 10%, respectively, in the urban areas, and 13% and 8%, respectively, in rural areas. The prevalence of simultaneous iron and zinc deficiencies was 9.2% and 2.7% in urban and rural areas. Children with anemia have higher percentages of folic acid deficiency than children with normal iron status. CONCLUSION: Iron and zinc deficiencies constitute the principal micronutrient deficiencies in Mexican children younger than 2 years old who use the health care services provided by IMSS. Anemia not associated with low ferritin values was more prevalent than iron-deficiency anemia. The presence of micronutrient deficiencies at this early age calls for effective preventive public nutrition programs to address them.

[Growth in weight and height in children less than two years old in the IMSS]. / Crecimiento en peso y longitud de los niños menores de dos años atendidos en el IMSS.

OBJECTIVE: To describe the physical growth in weight and height of children less than two years of age cared for the Mexican Institute of Social Security (IMSS). MATERIAL AND METHOD: A population-based National Survey, which was also regional representative, was carried out in Ordinary Regime (RO) and the IMSS-Oportunidades Program (IO). In two years (2000-2002) the study gathered data on 17,502 children from the RO and 9872 from IO. The measures of weight and length were made by nurses, according to WHO criteria. Growth is reported as weight and length for each month of age and gender, in tables and percentile curves derived from quintile regressions, using a third degree polynomial to smooth out the lines. RESULTS: The trends of the means of weight and height in the first two years of life in children cared by Instituto Mexicano del Seguro Social show a pattern similar to those described in healthy children in other populations. However, the values are lower than those obtained in developed countries. CONCLUSIONS: Children's growth at two years of age at the Instituto Mexicano del Seguro Social shows a curve that is lower than that of the reference population recommended by the World Health Organization as an international standard.

Alimentación complementaria en los niños mayores de seis meses de edad: Bases técnicas / Complementary feeding in infants over six months of age: technical basis

Se aborda la alimentación de los niños en el primer año de vida con sus dos grandes componentes: amamantamiento y alimentación complementaria. Se informa de los beneficios que proporciona la lactancia materna exclusiva a la salud de los niños, considerando el sexto mes como punto de corte para iniciar la alimentación complementaria. El propósito de este complejo proceso educativo es complementar la lactancia, aportando los nutrimentos propios de su cultura que el niño necesita para mantener el crecimiento y evitar problemas nutricios como desmedro y deficiencia de hierro y anemia. Se tocan los aspectos que deben cuidarse antes de iniciar la alimentación complementaria, y los que deben vigilarse durante su ejecución. Hay que conocer los motivos, los antecedentes de enfermedades relacionadas con la alimentación, la condición nutricia del niño y la importancia de la higiene en la preparación de los alimentos. De los puntos a considerar durante su implementación, que dura al menos los siguientes seis meses de vida, destacan los aspectos prácticos, los nutricios y los no nutricios. Los prácticos comprenden: la consistencia, la cantidad de inicio, la densidad energética y la importancia de variar y combinar los alimentos. Los nutricios son el uso de alimentos regionales para satisfacer las necesidades de los niños de esta edad, con énfasis en los que son fuente de proteínas y hierro como huevo, pescado, carnes rojas y leguminosas. Los aspectos no nutricios incluyen el respeto al hambre y la saciedad, así como que durante la alimentación se le apoye para que coma y se le proporcione el afecto que merece.

This review addresses infant nutrition during the first year of life considering breastfeeding and complementary feeding as its 2 main components. We discuss the benefits that exclusive breastfeeding gives to children, considering the 6th month as the recommended cut off point to initiate complementary feeding. Complementary foods for infants older than 6 months are necessary to maintain infant growth, prevent stunting, and iron deficiency anemia. It is important to consider that these foods should be given according with the culture in which the infant belongs. We discuss several aspects to consider before and throughout the process of complementary feeding. Before the onset of complementary feeding, it is important to know the motives; the allergic or intolerance food background; the state of the infant's nutritional status and the mother's knowledge of hygiene in food preparation. In the complementary food process, which lasts about 6 months, it is important to consider several practical, nutritious and non nutritious aspects. Among the practical aspects it is important to consider factors such as food consistency, size of the portion, food energetic density and the frequency of exchange and combination of different meals. The nutritious topic that must be highlighted is the correct selection of staple foods with the best source of proteins and iron, such as eggs, fish, red meats or legumes. Finally, the important non nutritional aspects to consider are the respect of the infant hunger/satiety cycle, the support of the baby's feeding and the encouragement of and appropriate affectionate environment.

The social construction of anemia in school shelters for indigenous children in Mexico.

Indigenous children in school shelters in Mexico suffer from anemia in spite of food that is subsidized, prepared, and served to them. Economically and biomedically centered strategies to reduce anemia have achieved only partial and short-term success. An interdisciplinary team investigated the food security system of the school shelters and collected data through interviews and participant observation. The analysis revealed that the children's nutrition depends on a frail chain of events in which a single link's failure can lead to nutritional insecurity. The authors conclude that the social actors involved in the process are mainly considering the economic aspects of nutrition, but anemia persists as a social construction of the faulty relationship between the institution that runs the shelters and the indigenous culture. The authors make suggestions for an intervention that empowers the community by involving it actively in solving the problem.