根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。It happens from time to time that after a whole morning of studying, you are tired in the afternoon. It is then that you may want to eat something sweet, perhaps a sweet drink or a chocolate bar to lift your mood.
But a study suggests that sugar can make you feel worse rather than lift your mood. The German and UK researchers collected data from 31 studies involving nearly 1,300 adults. Those emotions include anger, alertness, depression and tiredness. They found that people who have too much sugar become more tired and less alert within an hour, and that these feelings become more intense over time.
According to researchers when people take in sugar, their blood sugar levels rise rapidly, leading to a burst of energy and a short "feel good" period. However, as they begin to digest the sugar, their blood sugar levels decrease quickly, leading to a bad feeling. As with caffeine, this prevents the body from relaxing, leaving people being tired and less alert.
According to WHO, it is healthy to have the sugars found naturally in fruit, vegetables and milk, so long as they make up less than 5 percent of our daily total energy intake.
So the next time you feel tired and can't concentrate on study and work, perhaps you should think twice before you bite into a chocolate bar. There are still other ways to relieve tiredness.
A. Maybe a little exercise at midday is a better idea.
B. So cutting sweet food out of the diet is a good choice.
C. hey studied the effect of sugar on some aspects of mood.
D. After all, it's believed that a "sugar rush" gives you energy.
E. Sugar in any form is not necessarily good for the human body.
F. But the result of the study doesn't mean giving up sweet food altogether.
G. To remain on a "high", people may eat more sugar until they become addicted to it.