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The effect of serving size on correct energy (calorie) estimation among Canadian youth and young adults aged 16–24 years (n 1994) recruited from an online commercial panel, August 2014. Arrows added here for emphasis and did not appear on images shown to participants. *All comparisons were significantly different at the P<0·05 level (‘calories’=kilocalories; 1 kcal=4·184 kJ)
