Abstract Background Cardiovascular diseases (CVDs) are the main cause of morbidity and mortality in Brazil. Objective To provide population-based data on prevalence and factors associated with CVD risk factors. Methods Individuals aged ≥20 years from two editions of the cross-sectional Health Survey of São Paulo focusing on Nutrition (ISA-Nutrition), performed in Sao Paulo city in 2008 (n=590) and 2015 (n=610), were evaluated for: obesity, central obesity, waist/height ratio, high blood pressure (HBP), dyslipidemia, diabetes, and number of CVD risk factors ≥3. Prevalence was estimated according to complex survey procedures. Factors associated with cardiovascular risk factors were assessed using logistic regression, with statistical significance of p<0.05. Results Obesity and older age were associated with higher odds of all cardiovascular risk factors investigated, except for dyslipidemia. HBP was positively associated with being Black/Brown and negatively associated with being physicaly active in leisure time. Women were more likely to have increased adiposity indicators and three or more cardiovascular risk factors than men. Those with higher education had lower chances of having diabetes, HBP and dyslipidemia, and those with higher income had higher chances of having three or more risk factors. Former smokers had higher odds of diabetes, obesity, and high waist/height ratio, and smokers had higher odds of high non-HDL cholesterol levels. From 2008 to 2015, there was an increase (p<0.001) in the prevalence of diabetes (6.9% to 17.3%), HBP (31.9% to 41.8%), dyslipidemia (51.3% to 67.6%), and number of CVD risk factors ≥3 (18.9% to 34.1%). Conclusion This study shows increasing prevalence of CVD risk factors in adult population in Sao Paulo and may support the definition of target groups and priority actions on CVD prevention and treatment.

Resumo Objetivo: Estimar a prevalência de consumo de café da manhã e descrever os alimentos e nutrientes consumidos nessa refeição e durante todo o dia por adolescentes brasileiros. Método: Foram avaliados 7.276 adolescentes entre 10-19 anos no Inquérito Nacional de Alimentação 2008-2009, um estudo transversal de base populacional. As informações dos indivíduos foram coletadas nos domicílios. Os dados alimentares foram obtidos por dois registros alimentares. O café da manhã foi definido como a primeira refeição do dia entre 6h e 9h59. As diferenças entre os consumidores de café da manhã, consumidores ocasionais e aqueles que não tomam café da manhã foram testadas por meio do teste de qui-quadrado ou teste F para análise de regressão. Resultados: O café da manhã foi consumido por 93% dos adolescentes e seu consumo foi associado à idade, renda, região geográfica e área residencial. Os alimentos mais frequentemente consumidos foram pão branco, café, manteiga/margarina, biscoitos e bolachas refinados e leite integral. A ingestão média diária de energia total, açúcar e cálcio foi maior entre os consumidores ocasionais e aqueles que não tomam café da manhã. Aqueles que tomam café da manhã apresentam maior ingestão de vitaminas B12, C e D. O café da manhã contribuiu mais para a ingestão total de cálcio, fósforo, tiamina, riboflavina e vitaminas A, B6 e D (17%-32%), gordura trans e sódio (cerca de 30%) e menos para a ingestão de ácido fólico, vitamina C, ferro, zinco e fibras (8%-12%) e energia (16%). Conclusões: Apesar de a prevalência de consumo de café da manhã entre os adolescentes brasileiros ter sido alta, a qualidade nutricional dessa refeição está abaixo do ideal, destaca a necessidade de apoio aos adolescentes e suas famílias para possibilitar a escolha de alimentos mais densos em nutrientes.

Abstract Objective: To estimate the prevalence of breakfast consumption and describe the foods and nutrients consumed at this meal and throughout the day by Brazilian adolescents. Method: A total of 7276 adolescents aged 10-19 years were evaluated in the Brazilian National Dietary Survey 2008-9, a population-based cross-sectional study. Individuals' information was collected at home. Dietary data were obtained by two food records. Breakfast was defined as the first eating occasion of the day that occurred between 6 and 9:59 am. Differences between breakfast consumers, occasional consumers, and skippers were tested through Pearson's chi-squared test or F-test of regression analysis. Results: Breakfast was consumed by 93% of adolescents and it was associated with age, income, geographic region and household area. The most frequently consumed foods at breakfast were white bread, coffee, butter/margarine, refined cookies and crackers, and whole milk. The mean daily intakes of total energy, sugar, and calcium were higher among occasional consumers and skippers. Breakfast consumers had higher intake of vitamins B12, C, and D. Breakfast contributed more to total intake of calcium, phosphorus, thiamin, riboflavin, and vitamins A, B6, and D (17-32%), trans fat and sodium (about 30%) and less to folate, vitamin C, iron, zinc, and fiber (8-12%) and energy intake (16%). Conclusions: Although the prevalence of breakfast consumption among Brazilian adolescents was high, the overall nutritional quality of this meal is suboptimal, highlighting the need to support adolescents and their families to make more nutrient-dense food choices.

A influência da temperatura sobre a oxidação de biodiesel foi avaliada pelos parâmetros cinéticos e termodinâmicos do biocombustível de óleo de soja e gordura suína com antioxidantes sintéticos: 3-terc-butil-4-hidroxianisol (BHA), 3,5-di-terc-butil-hidroxitolueno (BHT), 2-terc-butil-hidroquinona (TBHQ) e galato de propila (PG), de acordo com delineamento de mistura simplex-centróide. Os parâmetros cinéticos foram determinados considerando-se reação de primeira ordem e aplicando a equação de Arrhenius. A adição de antioxidantes promoveu o aumento da energia de ativação (Ea), sendo TBHQ e PG os mais eficientes, apresentando efeito sinérgico. BHT e BHA foram os menos eficientes, assim como suas misturas. Os parâmetros termodinâmicos de ativação, avaliados pela equação de Eyring, não indicaram processos espontâneos (∆G‡ > 0) com valores de ∆H‡ positivos, e ∆S‡ positivos e negativos. O delineamento simplex-centróide indicou valor otimizado de 174,46 kJ mol-1 para a mistura contendo 33,33 e 66,67% de TBHQ e PG, respectivamente.

Temperature's influence on biodiesel oxidation was evaluated by kinetic and thermodynamic data in biofuel from soybean oil and lard with synthetic antioxidants: butylatedhydroxyanisol (BHA), butylatedhydroxytoluene (BHT), tert-butylhydroquinone (TBHQ), and propylgallate (PG) by simplex centroid mixture design. The kinetic parameters ware obtained by Arrhenius equation and showed that addition of antioxidants in all tests increased activation energy (Ea) and that TBHQ and PG were more efficient and presented synergistic effect. BHT and BHA were the least efficient, as well as their mixtures. The thermodynamic activation parameters of the reactions, evaluated by the Eyring equation and based on the theory of the activated complex (ACT), indicated no spontaneous processes (∆G‡ > 0) with positive ∆H‡ values and positive and negative ∆S‡ values. The application of simplex centroid mixture design, using Ea as response, showed the optimised value of 174.46 kJ mol-1 for a mixture containing 33.33 and 66.67% of TBHQ and PG, respectively.