单选题. Eating a Mediterranean-style diet—packed with fruits, vegetables, legumes (豆类), nuts, olive oil and fish—is good for your heart, many studies have found. Now scientists are suggesting the diet may be good for your mental health, too. A study of over 10,000 Spaniards followed for almost four and haft years on average found that those who reported eating a healthy Mediterranean diet at the beginning of the study were about half as likely to develop depression than those who said they did not stick to the diet. All of the participants were free of depression when they were recruited to the study, and each filled out a 136-item food frequency questionnaire when they joined. Based on their self-reported dietary habits, they were assigned a score between 0 and 9, with the highest score reflecting the closest sticking to a Mediterranean diet. Over time, those who had scored between 5 and 9 on the Mediterranean diet were 42 percent to 51 percent less likely to develop depression, the study found, than those who scored between 0 and 2. The study does not prove a cause-and-effect relationship between the Mediterranean diet and a lower risk for depression, only an association between the two. Still, many scientists are convinced that some damaging processes involved in cardiovascular (心脏血管的) disease may also play a role in mental health. "Both cardiovascular disease and depression share common mechanisms," said Dr. Miguel Angel Martinez-Gonzalez, professor of preventive medicine at University of Navarra in Pamplona, Spain, and senior author of the paper, published in the October issue of Archives of General Psychiatry. "The membranes (细胞膜) of our nerve cell are composed of fat, so the quality of fat that you are eating definitely has an influence on the quality of the neuron membranes, and the body's combination of neurotransmitters is dependent on the vitamins you're eating," Dr. Martinez-Gonzalez added. "We think those least sticking to the Mediterranean dietary plan have a deficiency of essential nutrients." The elements of the diet most closely linked to a lower risk of depression were fruits, nuts and legumes, the study found.1. Scientists have proved that a Mediterranean-style diet ______.
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