Institute for Diabetes Research and Metabolic Diseases of the Helmholtz Center Munich at the University of Tübingen, 72076 Tübingen, Germany; German Center for Diabetes Research (DZD e.V.), 85764 Neuherberg, Germany.
Institute for Diabetes Research and Metabolic Diseases of the Helmholtz Center Munich at the University of Tübingen, 72076 Tübingen, Germany; German Center for Diabetes Research (DZD e.V.), 85764 Neuherberg, Germany; Institute of Medical Psychology and Behavioural Neurobiology, University of Tübingen, 72076 Tübingen, Germany.
Appetite. 2018 Jun 1;125:492-501. doi: 10.1016/j.appet.2018.03.006. Epub 2018 Mar 7.
Obesity develops due to an imbalance between energy intake and expenditure. Besides the decision about what to eat, daily energy intake might be even more dependent on the decision about the portion size to be consumed. For decisions between different foods, attentional focus is considered to play a key role in the choice selection. In the current study, we investigated the attentional modulation of portion size selection during pre-meal planning. We designed a functional magnetic resonance task in which healthy participants were directed to adopt different mindsets while selecting their portion size for lunch. Compared with a free choice condition, participants reduced their portion sizes when considering eating for health or pleasure, which was accompanied by increased activity in left prefrontal cortex and left orbitofrontal cortex, respectively. When planning to be full until dinner, participants selected larger portion sizes and showed a trend for increased activity in left insula. These results provide first evidence that also the cognitive process of pre-meal planning is influenced by the attentional focus at the time of choice, which could provide an opportunity for influencing the control of meal size selection by mindset manipulation.
肥胖是由于能量摄入和消耗之间的不平衡导致的。除了决定吃什么，日常能量摄入可能更多地取决于要消耗的食物份量。对于不同食物的选择，注意力集中被认为在选择中起着关键作用。在当前的研究中，我们研究了餐前计划中份量选择的注意力调节。我们设计了一个功能性磁共振任务，其中健康参与者在选择午餐份量时被引导采用不同的心态。与自由选择条件相比，当参与者考虑为健康或愉悦而吃时，他们会减少份量，这分别伴随着左前额叶皮层和左眶额皮层的活动增加。当计划吃到晚餐饱时，参与者选择了更大的份量，并且左侧脑岛的活动增加趋势。这些结果首次提供了证据，表明餐前计划的认知过程也受到选择时注意力集中的影响，这为通过心态操纵来影响控制餐量选择提供了机会。
