Department of Foods and Nutrition, Purdue University, West Lafayette, IN, USA.
Food Nutr Res. 2008;52. doi: 10.3402/fnr.v52i0.1891. Epub 2008 Dec 19.
Animal experiments document effects of grape juice on cognitive performance and motor skills, and observational studies in humans suggest an inverse association between flavonoid intake and cognitive decline. These effects may be related to the antioxidant properties of polyphenols. Juice consumption and flavonoid intake may also affect appetite.
To study the acute effects of grape juice consumption on appetite, mood and implicit memory during a time of increased lethargy - the post-lunch dip.
Thirty-five participants with a mean age of 26 years who smoked a mean of 11 cigarettes/day for 8 years were included in the study. It included a practice session and two treatment sessions. All sessions involved consumption of grape juice or an energy-matched placebo with lunch followed by assessments of mood, implicit memory, appetite and food intake.
Mood decreased over time for both treatments, but there were no differences after lunch between grape juice and placebo for any measure.
This study did not document any acute effects of grape juice consumption on mood, implicit memory, appetite or food intake in smokers.
动物实验记录了葡萄汁对认知表现和运动技能的影响，而人类的观察性研究表明，类黄酮的摄入量与认知能力下降呈负相关。这些影响可能与多酚的抗氧化特性有关。果汁的摄入和类黄酮的摄入也可能影响食欲。
研究在嗜睡增加的时间（午餐后低谷期）内，饮用葡萄汁对食欲、情绪和内隐记忆的急性影响。
研究纳入了 35 名平均年龄为 26 岁的参与者，他们平均每天吸烟 11 支，吸烟史 8 年。研究包括一个练习阶段和两个治疗阶段。所有阶段均在午餐时饮用葡萄汁或能量匹配的安慰剂，并在之后评估情绪、内隐记忆、食欲和食物摄入量。
两种处理方式的情绪都随着时间的推移而下降，但午餐后，葡萄汁和安慰剂之间在任何测量指标上都没有差异。
本研究未发现吸烟者饮用葡萄汁对情绪、内隐记忆、食欲或食物摄入有任何急性影响。
