One study found healthy adults designated to a high-fat diet for five days showed impaired attention, memory, and mood compared with a low-fat diet control group.

一项研究发现，与低脂肪饮食的对照组相比，被指定连续5天吃高脂肪食物的健康成年人表现出注意力、记忆和情绪受损。

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Through displaying your talent in your study, you can get satisfaction from your achievements, which can help you keep a good mood.

通过在学习中展示自己的才华，你可以从你的成就中获得满足感，这能让你保持心情愉快。

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Researchers gauged study participants' mood before and after showing them one of two video clips.

研究者测量了该研究参与者看这两个视频剪辑之一的前后心情。

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Radio came out top in the study called 'Media and the Mood of the Nation', commissioned by the Radio Advertising Bureau.

BBC: complaints procedure 'convoluted'

But nearly 50% of the teens were said to have experienced symptoms of depression or a full-blown mood disorder, according to the study, which was presented on Saturday at an annual meeting of the American Academy of Pediatrics, in New Orleans.

CNN: Bullying, abuse linked to suicidal thoughts in kids

Anxiety disorders and depression are the most common mental illnesses: 28.8% of the general population will have an anxiety disorder in their lifetime and 20.8% will have a mood disorder, according to a 2005 study published in the Archives of General Psychiatry.

WSJ: How Much Sleep Do Children and Teenagers Need? Grown-Up Problems Start at Bedtime