Adolescents’ Estimation of Energy Content of Standard Portion Size of Foods and Its Association with Body Mass Index

Mi-Kyeong Choi, Min-Jung Ko, Mi-Hyun Kim

Department of Food and Nutrition, Kangwon National University, Gangwon, Samcheok 245-711, Korea.
Deptartment of Food and Nutrition, Kongju National University, Chungnam, Kongju 340-742, Korea.

DOI: 10.4236/fns.2012.310177                

Abstract

The purpose of this study is to identify the adolescents’ knowledge of the energy content of the standard portion size of foods and to investigate the association between their knowledge and energy intake and also body mass index (BMI). A total of 251 middle school adolescents participated in this study. Participants’ knowledge was assessed based on their estimation of the energy content of the standard portion size of foods. To estimate the energy intake of the subjects, 24-hr recall was used. The percentage of participants who accurately estimated (that is within 20% of the true value) the energy content of the standard portion size was calculated for each of the 32 typical foods. The food for which the most participants revealed the accurate estimation was cooked rice (39.5%). The proportion of students who overestimated the energy contents was highest for vegetables (98%), and oils and sugar (90%). The female students were more likely than males to provide the accurate estimation of energy contents for standard portion size of foods. After adjusting for age and sex, the estimation level ([estimation value/true value] × 100) of the energy content of some foods had a significant positive relationship with BMI, but had no significant relationship with reported energy intake. From these results, we concluded that the knowledge of energy content of food was poor among middle-school adolescents, with some gender difference, and that their estimation of the calorie contents of foods increased along with their BMI.

Keywords

Knowledge of Energy Content; Portion Size; Energy Intake; BMI; Adolescents

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	J. H. Ledikwe, J. A. Ello-Martin and B. J. Rolls, “Portion Sizes and the Obesity Eepidemic,” Journal of Nutrition, Vol. 135, No. 4, 2005, pp. 905-909.
[2]	J. O. Fisher, A. Arreola, L. L. Birch and B. J. Rolls, “Portion Size Effects on Daily Energy Intake in Low-Income Hispanic and African American Children and Their Mothers,” The American Journal of Clinical Nutrition, Vol. 86, No. 6, 2007, pp. 1709-1716.
[3]	M. T. Kelly, J. M. W. Wallace, J. M. W. P. J. Robson, K. L. Rennie, R. W. Welch, M. P. Hannon-Fletcher, S. Brennan, A. Fletcher and M. B. E. Livingstone, “Increased Portion Size Leads to a Sustained Increase in Energy Intake over 4D in Normal-Weight and Overweight Men and Women,” The British Journal of Nutrition, Vol. 102, No. 3, 2009, pp. 470-477. doi:10.1017/S0007114508201960
[4]	C. Gray, L. A. Lytle, R. Mays, G. Taylor, C. Perry and M. Story, “Foods on Students’ Trays When They Leave the Cafeteria Line as a Proxy for Foods Eaten at Lunch in a School-Based Study,” Journal of American Dietetic Association, Vol. 102, No. 3, 2002, pp. 407-409. doi:10.1016/S0002-8223(02)90094-5
[5]	S. Y. Ko and K. W. Kim, “Nutrition Label Use, SelfEfficacy, Snacking and Eating Behavior of Middle School Students in Kyunggi Area,” Korean Journal of Community Nutrition, Vol. 15, No. 4, 2010, pp. 513-524.
[6]	G. O. Kim and J. W. Lee, “Development and Evaluation of CAI Program on Food Guide Pagoda for Adolescents,” Chungnam Journal of Human Ecology, Vol. 19, No. 1, 2006, pp. 83-98.
[7]	The Korean Nutrition Society, “Dietary Reference Intake for Korean,” Hanarum Publishing, Seoul, 2010. doi:10.3803/EnM.2010.25.2.98
[8]	H. J. Sin, “A Study of Food Behavior and the Effectiveness of Nutrition Education Based on Food Weight in Middle School Male Student,” M.S. Thesis, Sookmyung Women’s University, Seoul, 1998.
[9]	V. del Balzo, A. Scanu, S. Dernini, O. Palmieri and C. Cannella, “Mediterranean Lifestyle: Nutritional Education On-Line,” Annali Di Igiene, Vol. 21, No. 6, 2009, pp. 565-573.
[10]	Ministry of Health and Welfare, Korea Centers for Disease Control and Prevention, “Korea Health Statistics 2009: Korea National Health and Nutrition Examination Survey (KNHANESIV-3),” Ministry of Health and Welfare, Seoul, 2010. doi:10.3886/ICPSR29022
[11]	G. Turrell, “Determinants of Gender Differences in Dietary Behavior,” Nutrition Research, Vol. 17, No. 7, 1997, pp. 1105-1120. doi:10.1016/S0271-5317(97)00082-1
[12]	K. Parmenter, J. Waller and J. Wardle, “Demographic Variation in Nutrition Knowledge in England,” Health Education Research, Vol. 15, No. 2, 2000, pp. 163-174. doi:10.1093/her/15.2.163
[13]	M. E. Oakes and C. S. Slotterback, “Gender Differences in Perceptions of the Healthiness of Foods,” Psychology & Health, Vol. 16, No. 1, 2001, pp. 57-65. doi:10.1080/08870440108405489
[14]	C. A. Roberto, P. D. Larsen, H. Agnew, J. Baik and K. D. Brownell, “Evaluating the Impact of Menu Labeling on Food Choices and Intake,” American Journal of Public Health, Vol. 100, No. 2, 2010, pp. 312-318. doi:10.2105/AJPH.2009.160226
[15]	P. S. Tandon, J. Wright, C. Zhou, C. B. Rogers and D. A. Christakis, “Nutrition Menu Labeling May Lead to Lower-Calorie Restaurant Meal Choices for Children,” Pediatrics, Vol. 125, No. 2, 2010, pp. 244-248. doi:10.1542/peds.2009-1117
[16]	T. Dumanovsky, C. Y. Huang, C. A. Nonas, T. D. Matte, M. T. Bassett and L. D. Silver, “Changes in Energy Content of Lunchtime Purchases from Fast Food Restaurants after Introduction of Calorie Labelling: Cross Sectional Customer Surveys,” British Medical Journal, Vol. 343, 2011, p. d4464. doi:10.1136/bmj.d4464
[17]	R. A. Carels, J. Harper and K. K. Konrad, “Qualitative Perceptions and Caloric Estimations of Health and Unhealthy Foods in Behavioral Weight Loss Participants,” Appetite, Vol. 46, No. 2, 2006, pp. 199-206. doi:10.1016/j.appet.2005.12.002
[18]	Y. Chen, D. B. Reed, N. Velikova and S. Wang, “University Student Sample Is Unable to Accurately Assess Their Calorie Needs: Implications for Weight Management and Menu Labeling,” Food and Nutrition Sciences, Vol. 3, No. 4, 2012, p. 503.