Rotulagem Calorie: ele afeta na compra de calorias em pontos de venda de catering e os pontos de vista dos jovens adultos?

Calorie-labelling of meals has been suggested as an anti-obesity measure, but evidence for impact is scarce. It might have particular value for young adults, when weight-gain is most rapid. A systematic literature review and a meta-analysis was performed to assess the effect of calorie-labelling on calories purchased. Seven studies met the inclusion and quality criteria of which six provided data allowing a meta-analysis. Three reported significant changes, all reductions in calories purchased (-38.1- -12.4 kcal). Meta-analysis showed no overall effect, -5.8 kcal (95% CI -19.4-7.8 kcal) but a reduction of-124.5 kcal (95% CI -150.7-113.8 kcal) among those who noticed the calorie-labelling (30-60% of customers). A questionnaire, to gauge views on calorie-labelling, was devised and sent to young adults in higher education: 1,440 young adults (mean age 20.3(SD2.9) years) completed the survey. Nearly half (46%) said they would welcome calorie-information in catering settings and on alcoholic drinks. Females opposing to calorie-labelling were heavier to those who did not (64.3 vs 61.9 kg, P=0.03; BMI 22.4 vs 21.7 kg/m(2), P=0.02). In conclusion, the limited evidence supports a valuable effect from clearly visible calorie-labelling for obesity-prevention, and it appears an attractive strategy to many young adults.International Journal of Obesity accepted article preview online, 01 September 2014. doi:10.1038/ijo.2014.162.