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一项新研究表明，用蓝色杯子或玻璃杯喝咖啡会降低咖啡的苦味，不用加糖就会感觉更甜。 实验表明，相比玻璃杯，用白色杯子喝咖啡会感觉味道更浓；而相比有颜色的杯子，用白色杯子喝咖啡会感觉味道更苦。 研究结果显示，用蓝色杯子喝咖啡感觉最甜。 科学家认为，白色杯子会加重咖啡颜色的视觉效果，而咖啡的褐色是和苦味联系在一起的。 先前的研究就发现，颜色会改变食物的口感。红色草莓口味慕斯蛋糕盛放在白色盘子上比乘放在黑色盘子上感觉更甜更可口。 More than 2.25 billion cups of coffee are consumed across the globe each day, and its likely that many taste bitter. Now, a new study suggests that coffee fans can make their drink taste sweeter by simply swapping the colour of their cup. Scientists claim that blue and glass mugs, which are popular in some coffee shops, reduce a coffee’s bitterness, without any need for sugar. Researchers from Federation University Australia and the University of Oxford set out to prove whether a barista’s claim - that coffee drunk from a white cups tastes bitter - was true. They used 36 volunteers and three different coloured cups - blue, white and transparent glass - to investigate the claim. In one experiment, the white mug enhanced the rated ‘intensity’ of the coffee flavour relative to the transparent mug, according to the study published in the journal Flavour. | 
