Nutrition - Obesity Essay Example for Free

Nutrition Obesity seekObjective To assess the association amidst the consumption of degraded victuals (FF) and body mass world power (BMI) of teen growrs in a large UK get cohort. Methods A structural equation clay sculptureling (SEM) approach was elect to allow direct statistical testing of a theoretical example. SEM is a combination of confirmatory agentive role and path analysis, which allows for the inclusion of latent (unmeasured) variables. This approach was use to body-build two models the effect of FF outlet visits and viands choices and the effect of FF moving picture on consumption and BMI. Results A fundamental of 3620 participants had entropy for elevation and weighting unit from the age 13 clinic and the absolute frequency of FF outlet visits, and so were included in these analyses. This SEM model of intellectual nourishment choices showed that adjustment magnitude frequency of tuckering at FF outlets is positively associated with high consum ption of membrane-forming pabulums (b ? 0. 29, Po0. 001) and negatively associated with the consumption of water-loving foods (b ? A1. 02, Po0. 001). The SEM model of FF movie and BMI showed that high exposure to FF increases the frequency of visits to FF outlets (b ? 0. 61, Po0.001), which is associated with higher body mass world power standard di mutant score (BMISDS b ? 0. 08, Po0. 001).Deprivation was the largest contri thating variable to the exposure (b ? 9. 2, Po0. 001). Conclusions The teens who ate at FF restaurants consumed much membrane-forming foods and were much(prenominal)(prenominal) than likely to stool higher BMISDS than those striplings who did non eat a great deal at FF restaurants. Teenagers who were exposed to more takeaway foods at position ate more denouncely at FF restaurants and eating at FF restaurants was likewise associated with lower intakes of vegetables and huffy fruit in this cohort. transnational ledger of Obesity (2011) 35, 13251330 doi10. 1038/ijo. 2011. 120 create online 28 June 2011 Keywords fast food all overweight ALSPAC Introduction Childhood obesity prevalence countenance move dramatically in the last 30 social classs in the Western world with the most late(a) figures for England and Wales show that 17% of boys and 16% of girls be obese. 1 An increase in the availability of calorie indistinct foods is implicated as hotshot of the factors in the aetiology of the obesity epidemic. turbulent food (FF) is one scratch of the food market that has grown steadily over the last few decades and it was worth d8.9 trillion in the get together Kingdom in 2005. 2 FF is typically quick, convenient, cheap and Correspondence Dr LK Fraser, School of Geography, University of Leeds, University road, Leeds LS2 9JT, UK. e-mail l. k. emailprotected ac. uk Received 6 February 2011 revised 21 April 2011 accepted 12 May 2011 published online 28 June 2011 logical in its production,3 but FF is very much hig h in saturated fats, energy dense and has low micronutrient content. 49 Studies from the United States of America have shown that children who consume FF (when compared with children who do not eat FF) have higher energy intake and higher fat intakes9,10 as well as lower vegetable and take out intake.10,11 Therefore, the consumption of such foods could possibly result in a positive energy balance and hence, weight gain. There is some evidence from longitudinal studies in the United States of America that consuming FF as a teenager can result in weight gain in both wee12 and middle adulthood. 13 FF is often marketed to children and adolescents through television, internet and movie advertising,1417 with brand recognition being present from an primeval age. 18 The addition of toys as gifts with FF meals in addition attracts children.There is growing body of literature that has assessed the location of FF outlets and has ground that theatres of higher deprivation Fast food and bo dy mass indicant LK Fraser et al 1326 have more FF outlets1921 and that FF outlets are often located close to schools. 2224 The majority of look to picture has been undertaken in the United States of America, but a drive that analysed the fat content of a FF meal in McDonalds and Kentucky Fried Chicken outlets in 35 countries showed that the amount of fat varied considerably surrounded by countries, within the same FF outlet.25 This means that results from studies in the United States of America whitethorn not be generalisable to other(a) countries. This news report aims to assess the cross-sectional association between the consumption of FF and the body mass index (BMI) of teenagers in a large UK birth cohort. Methods The info for this study were obtained from the Avon Longitudinal Study of Parents and Children (ALSPAC),26 which is a birth cohort study where pregnant mothers who lived in the onetime(a) Avon County in the United Kingdom (the Bristol region) were recruited i n the early 1990s. A total of 14 541 mothers unblemished recruitment.Because of retrospective recruitment the total sampling size was 15 224 fetuses and 14 610 live births. This paper presents data on the teenagers who attended the year 13 clinic and completed the year 13 questionnaire. Variables The food frequency data were collected from the questionnaires completed by mother (or carer) and separate questionnaires completed by the teenagers themselves at age 13 years. The data used from the carer questionnaire (collected at the same time point) referred to the questions How often does s/he eat in a FF restaurant?The responses to this question were collected as never/rarely, once a month, once every 2 weeks, once or twice per week, 34 times a week, 5 or more times a week. The carers were likewise asked In total, how legion(predicate) portions of vegetables does s/he eat in a week (do not include potatoes), In total, how many portions of raw fruit does s/he eat in a week? The se were free mathematical responses, which were retained as a continuous variable for analyses.In the food frequency part of the teenager completed questionnaire the teenagers were asked If you ever buy food yourself from outside school, or from school vending machines, how often do you buy and eat each of the following things (include after school and weekends) chips, burger, pizza, sandwich, pies or pasties, chocolate, crisps, fruit and other food. The height and weight data were collected at clinic visits at B13 years. The exact age, sex, height and weight were used to prefigure a BMI standard going away score (BMISDS) for each participant (1990 UK reference dataset). 27 The teenagers International Journal of Obesity were classified as obese if their BMISDS was greater than the 95th percentile (BMISDS41. 64). The physical activity data were collected via accelerometry at the age 13 clinic visit.28 The participants wore an accelerometer for seven consecutive twenty-four hourss and the measure used from this is mean counts per handsome, which is a continuous variable. A deprivation score was assigned to each participant by matching the coordinates of their residential address (when carer questionnaire was completed) to the appropriate lower passing output area. Each lower super output area has an index of multiple deprivation score (Index of Multiple Deprivation 2007 (IMD))29 assigned from the topical anaesthetic census data. This is a continuous variable in which a higher number indicates an area of higher deprivation.Ethnicity was assigned as per the childs ethnicity into a binary variable of white British and other ethnicity. Statistical modeling Descriptive statistics were performed in STATA version 10 (StataCorp LP, College Station, TX, USA). A structural equation modelling (SEM) approach was elect to allow direct statistical testing of a theoretical model. SEM has many benefits over traditional regression techniques, which include the ability to model equations simultaneously and the incorporation of latent variables. 30 SEM is a combination of confirmatory factor and path analysis, which allows for the inclusion of latent (unmeasured) variables.31 This approach was used to build two models the effect of FF outlet visits and food choices and the effect of FF exposure on consumption and BMI. The SEM analyses were undertaken in AMOS version 17. 0 (IBM SPSS, USA). The hypothesised model for food choices is shown in the results section ( common fig tree 2). The observed variables are displayed as boxes and latent variables as circles. Each observed variable has an associated random error term and each latent variable has an associated hitch term, which represents the variance in the latent variable that has not been explained by the observed variables associated with that latent variable. degeneration paths are shown by singleheaded arrows and covariances by double-headed curved arrows. The model fit was assessed by two indic es the comparative fit index (CFI) and the root mean square error of approximation (RMSEA). The CFI is a comparison of the hypothesised model compared with an independence model where all parameters are assumed to be independent. The RMSEA gives an indication of how well would the model, with unknown but optimally chosen values, fit the population covariance matrix if it were available.32 A combination of CFI40. 95 and a RMSEA of o0. 50 is a sign of good model fit. The w2-test of overall fit is very sensitive to large sample size so has not been used in these models. 30 The two models were constructed a priori using preliminary research. The nutritional content of chips, burgers, pizza and Fast food and body mass index LK Fraser et al 1327 pies are known to be high in saturated fat and energy and therefore are arthritic,49,33 whereas fruit and vegetables are known to contain fibre and vitamins and so are classified as well-grounded.Exposure to FF outlets is known to be higher in areas of higher deprivation. 1921 In the food choices model, unhealthy consumption (latent variable) was modelled from the frequency of consumption of chips, burger, pizza and pies (reported by the teenagers themselves), and the healthy consumption was modelled from the number of pieces of vegetables and raw fruit consumed by the teenager (maternal report). The number of times that the teenager visited a FF outlet (maternal report) was regressed on the unhealthy and healthy consumption variables. The model for the effect of FF exposure on consumption and BMISDS is shown in Figure 3.hither exposure is a latent variable modelled from maternal and paternal takeaway frequency and deprivation score. The exposure is regressed on the number of visits to FF outlet. The BMISDS at age 13 years is the main outcome of this model. Ethical approving for the study was obtained from the ALSPAC Law and Ethics Committee and the local research ethics committees. Results A total of 3620 participants h ave data for height and weight from the age 13 clinic and the frequency of FF outlet visits, and were included in these analyses (SEM cannot use individuals with missing data). A total of 1711 (47. 3%) were boys and 456 (12.6%) obese.The descriptive statistics are shown in Table 1. Frequency of visit FF outlets and food consumption frequencies are shown in Figure 1. The results of model 1 are shown in Figure 2 with regression weights shown in Table 2. This model showed that increase frequency of eating at FF outlets was positively associated with higher consumption of unhealthy foods (b ? 0. 29, Po0. 001) and negatively associated with the consumption of healthy foods (b ? A1. 02, Po0. 001). The CFI for model 1 was 0. 98 and the RMSEA was 0. 05 (90% trustingness interval 0. 044, 0. 058). These represent good approximate model fit. Table 1.The results of model 2 are shown in Figure 3 with regression weight shown in Table 3. This model showed that increased exposure to FF increased t he frequency of visits to FF outlets (b ? 0. 61, Po0. 001), which in turn was associated with higher BMISDS (b ? 0. 08, Po0. 001). Deprivation was the largest contributing variable to the exposure (b ? 9. 2, Po0. 001). The CFI for model 2 was 0. 98, and the RMSEA was 0. 021 (90% confidence interval 0. 009, 0. 033). These represent very good approximate model fit. Discussion This study shows that teenagers who are exposed to more unhealthy foods at home are more likely to eat at FF restaurants and have a higher BMISDS.The negative association of increased visits to FF outlets on consumption of healthy foods (fruit and vegetables) has also been demonstrated. The FF restaurant use in this analysis was reported by the mother or main carer of the teenager and showed that nearly 60% of all the teenagers ate at a FF restaurant at least once a month. This appears to be little(prenominal) frequently than in the United States of America, where studies showed that 60% of older children and ad olescents ate FF more than once per week34 and that B30% of children ate at a FF restaurant on any typical day. 9.As one part of the SEM this study showed that eating at a FF outlet was associated with a higher BMISDS. There were no previous UK studies to compare these results with, but previous studies from the United States of America have not found coherent results. Boutelle et al. 11 found no association between frequency of FF consumption and adolescent BMI or weight status, and an Australian study Descriptive statistics Mean BMISDS Deprivation (IMD 2007)29 Physical activity (c. p. m. ) Raw fruit (portions per week) Vegetables (portions per week) s. d. median value IQR 0. 29 13. 7 541 9. 5 9. 5 1. 14 11. 4 190 7 7 0. 024 10. 6 511 8 8 A0. 47, 1. 06 5.9, 17. 0 404, 653 5, 14 5, 12 Abbreviations BMISDS, body mass index standard deviation score for age and sex c. p. m. , cycles per minute IMD 2007, Index of Multiple Deprivation 2007 IQR, interquartile range. Figure 1 fooding f requency data. International Journal of Obesity Fast food and body mass index LK Fraser et al 1328 Figure 2 Results of SEM model of food choices. Table 2 Results of SEM model of food choices Regression weights a Unhealthyfast food wellnessyfast food Chipsunhealthy Burgerunhealthy Fruithealthy Vegetableshealthy Pizzaunhealthy Piesunhealthy Estimate s. e. CR P 0. 285 A1. 023 1. 000 0. 732 1. 000 1. 157 0. 774 0.530 0. 021 0. 124 13. 439 A8. 274 o0. 001 o0. 001 0. 016 45. 243 o0. 001 0. 148 0. 018 0. 016 7. 802 42. 483 32. 720 o0. 001 o0. 001 o0. 001 Abbreviations CR, critical ratio SEM, structural equation modeling. aAll consumption variables units never/rarely, once a month, once every 2 weeks, once or twice per week, 34 times a week, 5 or more times a week. showed that FF eaten at home (but not away from home) was associated with higher BMI in adolescents (MacFarlane).Two longitudinal studies using data from the CARDIA study found that higher FF intake in adolescence was associated with higher BMI in young adulthood12 and those who ate FF more than twice a week had put on an extra 4. 5 kg of weight 15 years later. 13 The teenagers who ate more frequently at FF restaurants were more likely to eat less fruit and vegetables, as well as consume more unhealthy foods (chips, burger, pizza, pies) than those teenagers who ate at FF restaurants less frequently.This is an indication that the consumption of unhealthy foods may displace healthy food choices. This is similar to previous research in the United States of America, International Journal of Obesity which showed that children who ate FF consumed 45 g less vegetables per day than children who did not eat FF.10 At age 13 years the food frequency data were a combination of maternal and self-report from the teenagers, but the total macro- and micronutrient values could not be assessed in this study as these data were not yet available at the time of writing. Deprivation was the largest contributor to the FF exposure variable. This could be explained by the fact that those of higher deprivation eat more FF because of the relative cheapness of FF. It has also been shown in many studies in the United Kingdom and the United States of America that areas of higher deprivation have more FF outlets than more affluent areas therefore, FF is more readily available.35 An interesting economics paper from the United States of America showed that increasing the cost of FF by $1 could decrease BMI by 0. 78 units. 36 The increased consumption of unhealthy foods (chips, burger, pizzas and pies) by those teenagers who ate more frequently at FF outlets was not surprising, but the associated negative effect of the consumption of fruit and vegetables by these participants is important. These teenagers will not only be consuming more of the saturated fat and salt from the burgers, and so on, but at the same time they are not consuming important nutrients from fruit and vegetables.Although many FF outlets now prolo ng more healthy choices such as fruit and vegetables, the consumers may still be choosing the unhealthy foods. Fast food and body mass index LK Fraser et al 1329 The FF question completed by the carer did not specify what constituted FF so some respondents may only count large franchises as FF whereas others may use a broader definition that includes independent takeaways. Although the frequency of eating at a FF restaurant was asked, the carers were not asked about the food eaten from these establishments and many FF restaurants now offer more healthy alternatives.Although the majority of FF items do not meet the Food Standards Agency nutrient standards for total fat, saturated fat, sugar and atomic number 11 there are wide variations in similar products from different FF outlets with sodium content varying by up to four times in fried chicken products. 37 Therefore, having data on which food items were consumed from which FF outlet would further enhance future studies. There was no information on why the teenagers ate at FF restaurants, and key questions for the future include was there no alternative eating establishments in their neighbourhood?Did they prefer FF to other meals or was the cost of food important? Conclusions This study has shown that the teenagers who ate at FF restaurants consumed more unhealthy foods and were more likely to have higher BMISDS than those teenagers who did not eat frequently at FF restaurants. Teenagers who were exposed to more takeaway foods at home ate more frequently at FF restaurants. Eating at FF restaurants was also associated with lower intakes of vegetables and raw fruit in this cohort. Figure 3 The SEM model of FF exposure and BMI. Table 3 Results of SEM model of FF exposure and body mass index Regression weights Fast food exposure.Maternal fast foodexposure Deprivationexposure Paternal fast foodexposure BMISDSfast food BMISDSc. p. m. a Estimate s. e. CR 0. 61 1. 000 9. 20 0. 66 0. 08 0. 00 0. 07 8. 654 1. 07 0. 08 0. 02 0. 00 8. 605 8. 680 3. 586 A3. 351 P o0. 001 o0. 001 o0. 001 o0. 001 o0. 001 Abbreviations BMISDS, body mass index standard deviation score for age and sex c. p. m. , cycles per minute CR, critical ratio FF, fast food IMD 2007, Index of Multiple Deprivation 2007 SEM, structural equation modeling. a All consumption variables units never/rarely, once a month, once every 2 weeks, once or twice per week, 34 times a week, 5 or more times a week.Strengths/limitations This is a large dataset with good-quality height and weight data taken at clinic visits by trained faculty using validated equipment. There were food consumption data about the teenagers available from both the teenagers and their carers, but this is a cross-sectional study so causation cannot be implied from this data. As expected in a longitudinal study there is attrition and the subcohort used in this study may not be truly representative of the whole cohort. Conflict of interest The authors declare no conflict of interest. Acknowledgements.We are super grateful to all the families who took part in this study, the midwives for their help in recruiting and the whole ALSPAC team, which include interviewers, computer and research lab technicians, clerical workers, research scientists, volunteers, managers, receptionists and nurses. The UK Medical Research Council (grant ref 74882), The Wellcome Trust (grant ref 076467) and the University of Bristol provide core computer backup for ALSPAC. LKF was funded by ESRC/MRC studentship.References 1 Craig RS. Health survey for England 2007, 2008. Available from http//www. natcen. ac. uk/study/health-survey-for-england-2007. 2 Keynote.UK fast food and home delivery outlets, 2006. 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J Health Econ 2009 28 963970. 37 Dunford E, Webster J, Barzi F, Neal B. nourishing content of products served by leading Australian fast food chains. Appetite 2010 55 484489. Copyright of International Journal of Obesity is the property of Nature Publishing Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holders express written permission. However, users may print, download, or email articles for individual use.