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  3. Using data from a research study that took place in the U. K. which asked families to report on their diets, the team found that

Using data from a research study that took place in the U. K. which asked families to report on their diets, the team found that

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问题    Using data from a research study that took place in the U. K. which asked families to report on their diets, the team found that vegetarian males were more likely to be depressed than their carnivorous (食肉的) counterparts. The sample included nearly 10 000 men who had a pregnant partner, and everyone identified their dietary preference. Only 350 were reported being vegetarian.
   The scientists compared how both plant- and meat-eaters fared on the Edinburgh Postnatal Depression Scale, used by U.K. doctors to determine if women are likely to develop postpartum (产后的) depression. The team found that vegetarians were more likely to have scores higher than 10, the minimum threshold of possible depression. They report their findings in the current issue of the Journal of Affective Disorders.
   The survey ferreted out some honesty about what exactly the participants meant by "vegetarian." Although the men who said they followed such a diet didn’t eat burgers or hot dogs, they did consume nearly as much oily fish and shellfish as meat-eaters. And those who identified as vegetarian actually did indulge in red meat: 72 reported some consumption while only 16 of the vegetarians admitted to cheating.
   The researchers don’t assert that being vegetarian causes depression. Instead, they’re suggesting a link between plant-based diets and mental health. The primary theory for this link is that vegetarians receive fewer nutrients found in red meat, vitamin B12 specifically, and that could contribute to depressive symptoms. But the study authors believe this new data should spur a randomized controlled trial to further examine the relationship between meat and mood.
   Studies have increasingly shown that nutrition and depression are linked. As researchers noted in a paper, nutritional neuroscience has just begun looking at how nutrition impacts cognition, behavior and emotion. Many patients with mental disorders have deficiencies in certain nutrients, including omega-3 fatty acids and B vitamins. In a small study of patients, doctors found that coupling vitamin B12 supplements with antidepressants significantly decreased symptoms.  
Why do researchers suggest associating plant-based diets with mental health?
选项 A、Because many vegetarians become mentally disturbed.
B、Because the lack of nutrients in vegetarian diets may lead to depression.
C、Because some vegetarians admitted to cheating in the previous experiment.
D、Because plant-based diets prove to provide more nutrients for curing depression.
答案B
解析
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