Associations between dietary intake and physical activity, as behavioral indicators, with body fat in adolescents from Mexico.

Introduction: Introduction: the prevention of cardiometabolic diseases is currently a priority due to its relationship with COVID-19 complications. Unhealthy lifestyles, like inadequate diet and physical inactivity, are the cornerstone for obesity and cardiometabolic risk. Objective: to examine the association between diet and physical activity with body fat in Mexican adolescents. Methods: the study was cross-sectional. Data included socio-demographic variables, health history and smoking habit obtained through questionnaires; blood pressure and anthropometry measurements; food and nutrient intake through 24-hour recalls; and physical activities through the International Physical Activity Questionnaire (IPAQ). Univariate analyses were used and multiple models were built by stepwise forward selection (p ≤ 0.05 and biological plausibility). Results: participants were n = 230 students, 18.5 ± 0.4 years and 54.8 % men. Three models associated with body fat were obtained. In the first model, saturated fatty acids (ß = 0.30, p = 0.028) were significant positive associated, while vigorous physical activity was significant negative associated as a protective factor (ß = -0.007, p = 0.023). In the second model, total fat (ß = 0.17, p = 0.005) was significant positive associated, and vigorous physical activity was significant negative associated (ß = -0.007, p = 0.023). The third model included fruits and vegetables (ß = -5.49, p = 0.092) and vigorous physical activity (ß = -0.006, p = 0.058) as protective factors. Conclusions: dietary intake of total fat and saturated fatty acids, and vigorous physical activity, were significantly associated with body fat, while fruits and vegetables trended toward significance, in Mexican adolescents. Community-based programs that promote intake of protective foods and reduction of risky foods, and encourage vigorous physical activity, are needed in adolescents.

Introducción: Introducción: la prevención de enfermedades cardiometabólicas es actualmente una prioridad por su relación con las complicaciones de la COVID-19. Los estilos de vida poco saludables son la piedra angular de la obesidad y el riesgo cardiometabólico. Objetivo: examinar la asociación entre dieta y actividad física con la grasa corporal en adolescentes mexicanos. Métodos: el estudio fue transversal. Los datos incluyeron variables sociodemográficas; mediciones de presión arterial y antropometría; ingesta de alimentos y nutrimentos con recordatorios de 24 horas; y actividades físicas con el cuestionario internacional de actividad física (IPAQ). Se utilizo análisis univariado y los modelos múltiples se construyeron mediante selección paso a paso hacia adelante (p ≤ 0.05 y plausibilidad biológica). Resultados: participaron n = 230 estudiantes, 18,5 ± 0,4 años y 54,8 % hombres. Se obtuvieron tres modelos asociados a la grasa corporal. En el primero, los ácidos grasos saturados (ß = 0,30, p = 0,028) se asociaron significativamente de forma positiva, y la actividad física vigorosa significativamente de forma negativa como factor protector (ß = -0,007, p = 0,023). En el segundo, la grasa total (ß = 0,17, p = 0,005) se asoció positivamente y la actividad física vigorosa, negativamente (ß = -0,007, p = 0,023). El tercer modelo incluyó frutas y verduras (ß = -5,49, p = 0,092) y actividad física vigorosa (ß = -0,006, p = 0,058) como factores protectores. Conclusiones: la ingesta dietética de grasas totales y saturadas y la actividad física vigorosa se asociaron significativamente con la grasa corporal, mientras que las frutas y verduras tendieron a ser significativas. Se necesitan programas comunitarios que promuevan la ingesta de alimentos protectores y la reducción de alimentos de riesgo, y fomenten la actividad física vigorosa en adolescentes.

Treatment of tequila distillation volatile residues by electrochemical oxidation using titanium electrodes.

Tequila production occurs in Mexico's designated area of origin, principally in the Jalisco State. Its residues are a challenge in treatment and tracking due to a lack of technology, non-economic treatments available, low environmental consciousness and incipient control from authorities. In 2021, average production was close to 1.5 million tequila litres per day with an estimated residue yield of 10-12 litres of stillage (tequila vinasses) per tequila litre produced, including volatile fractions. This research aims to reduce organic matter by electrooxidation (EO) from 5 distillation volatile residual effluents (two-stage still distillation) from three tequila distilleries, first and second-stage heads and heads and tails and second-stage non-evaporated fraction. Round 3 mm titanium (grade-1) electrodes (one anode and one cathode) were used, with fixed voltage to a value of 30 VDC at 0, 3, 6, 9 and 12 h with 75 experiments. Gas chromatography was used to analyse methanol, ethanol, acetaldehyde, ethyl acetate, n-propanol, sec-butanol, iso-butanol, n-butanol, iso-amyl, n-amyl, and ethyl lactate content. Treatment shows positive results, reducing organic matter content in all effluents in a Chemical Oxygen Demand COD range of 580-1880 mg/L.h, particularly useful in the second-stage non-evaporated fraction for water recovery.HIGHLIGHTSResidual effluent treatment is beneficial to environmental and resource sustainability.Process without adding materials achieving cleaner treated effluents.Process aimed as the final step to recover water.This process could help the Tequila industry to reach a higher sustainability level by reducing water usage and untreated residues.

Efficiency of an up-flow Anaerobic Sludge Blanket reactor coupled with an electrochemical system to remove chloramphenicol in swine wastewater.

The application and design of treatment systems in wastewater are necessary due to antibiotics' potential toxicity and resistant genes on residual effluent. This work evaluated a coupled bio-electrochemical system to reduce chloramphenicol (CAP) and chemical oxygen demand (COD) on swine wastewater (SWW). SWW characterization found CAP of <10 µg/L and 17,434 mg/L of COD. The coupled system consisted of preliminary use of an Up-flow Anaerobic Sludge Blanket Reactor (UASB) followed by electrooxidation (EO). The UASB reactor (primary stage) was operated for three months at an organic load of 8.76 kg of COD/m3d and 50 mg CAP/L as initial concentration. In EO, we carried out a 22 (time operation and intensity) factorial design with a central composite design; we tried two Ti cathodes and one anode of Ti/PbO2. Optimal conditions obtained in the EO process were 240 min of operation time and 1.51 A of current intensity. It was possible to eliminate 44% of COD and 64.2% of CAP in the preliminary stage. On bio-electrochemicals, total COD and CAP removal were 82.35 and >99.99%, respectively. This coupled system can be applied to eliminate antibiotics and other organic pollutants in agricultural, industrial, municipal, and other wastewaters.