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The role of attentional biases to appetitive stimuli in childhood overweight.

Overweight during childhood constitutes a high-risk factor for adult obesity. An abnormal attention to food stimuli (i.e., a bias) has been suggested as an underlying mechanism to the onset and/or maintenance of obesity. Previous literature supports the existence of a biased attention toward food stimuli in adults with obesity. However, it is unknown whether this attentional bias occurs in high-risk children for adult obesity. We aimed to examine attentional biases to food at different stages of attention processing in overweight children. A dot-probe task was applied to 25 children with overweight and 25 healthy-weight children (8-12 years old). Attentional preference to or avoidance of pleasant food stimuli, which were displayed simultaneously with pleasant non-food stimuli (matched in valence and arousal), was examined at 100-ms (initial visual orienting), 500-ms (attention engagement), and 1500-ms (maintained attention) presentation rates. Both children with overweight and healthy-weight children showed an attentional bias toward food images at a 100-ms presentation rate. However, unlike healthy-weight children, those with overweight showed an attentional preference toward food images at 500- and 1500-ms presentation rates. A biased initial orienting to food cues can be found regardless of weight. However, a biased attention engagement and a biased maintained attention toward food cues are characteristics of children with overweight. Therefore, as in adults, children at risk of adult obesity have an abnormal attentional processing of food stimuli.

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