A new study shows that eating nuts and peanut butter may help prevent one form of the disease diabetes （糖尿病）.Adult-onset or Type Two diabetes affects about 135 million people around the world.The disease results when the body cannot produce or use a substance called insulin （胰岛素）.Insulin is produced in the organ （器官） called the pancreas.Insulin helps turn sugar in foods into energy.
The Journal of the American Medical Association published the findings.Scientists from the Harvard University School of Public Health in Cambridge,Massachusetts completed the research.They studied more than 83，000 women for 16 years.The women were 34 to 59 years old.None of the women had diabetes,cancer or heart disease when the study began.During the study,more than 3，000 women developed diabetes.
The women answered questions every four years between 1980 and 1996.The researchers asked what they ate,including information about nuts and nut products.Some of the women ate nuts five days a week.The size of each serving weighed about 30 grams.Or,they ate a serving of peanut butter five days each week.Other women in the study did not eat nuts or peanut butter.Those who ate nuts five times a week were more than twenty percent less likely to develop Type Two diabetes than the women who did not eat nuts.
Although the study involved only women,the researchers believe eating nuts would also be good for men.The scientists say more research is needed to confirm the findings.But the study suggests that the fats in nuts may improve the way the body makes and uses insulin.
Nuts contain magnesium,which helps balance insulin and levels of sugar in the blood.The fats in nuts also may improve the body's ability to process sugar in the blood.People who suffer from diabetes have too much sugar in their blood and urine,the body's liquid waste.



What can we learn about the women involved in the new research？ ______

A. All the women had to answer questions every week.
B. Some women were not allowed to eat nuts on purpose.
C. Some of them suffered from diabetes because of the research.
D. Women who ate nuts regularly had lower risk of having diabetes.

What do Paragraph 3 and Paragraph 4 mainly focus on？ ______

A. Who did the findings.
B. What happened to the women.
C. How the research was carried out.
D. How much nuts women should eat.

What helps prevent diabetes according to the new research about nuts？ ______

A. Insulin in nuts.
B. The fats in nuts.
C. Sugar in the blood.
D. People's urine.

What's the author's purpose by writing the passage？ ______

A. To show the importance of insulin.
B. To introduce a new study about eating nuts.
C. To introduce a new way to deal with diabetes.
D. To encourage people to eat as many nuts as possible.