We need a varied diet，and one way to do this is by eating all the colors of the rainbow.The proof may be in the Mediterranean diet，which contains a lot of fruit，vegetables and healthy fats. "Eating a traditional Mediterranean diet means you consume different nutrients and phytonutrients，" says Francesco Sofi of the University of Florence.Phytonutrients are small chemical compounds produced by plants that help us digest larger nutrients.
Really，he adds，the colors of the Mediterranean diet are no different to other vegetable-based diets.There're thus other reasons why it is among the healthiest.For example，Mediterranean populations traditionally boil，rather than fry，their vegetables，which preserves nutrients，Sofi says.
The health benefits of a diet rich in fruit and vegetables on our brain and heart are among the most consistent findings within nutrition science，says Deanna Minich of the University of Western States in Portland，Oregon.Plant foods contain thousands of phytonutrients.
According to Tian - shin Yeh of Harvard T.H.Chan School of Public Health，eating a colorful diet can help people avoid possible side effects of eating too much of one food. "Research has found that orange juice can reduce the risk of cognitive（認(rèn)知的） decline，but too much intake is associated with type 2 diabetes，" she says.
Minich argues that the rainbow diet isn't limited to fruit and vegetables，but includes other natural foods，such as herbs，spices，nuts，seeds，and even tea.She also considers white food as part of the rainbow diet，including tofu.Eating various colors could mean we eat more fruit and vegetables overall.
There're other ways to get a range of nutrients and phytonutrients from your diet，researchers say.One study found that participants who ate bitter and strong tasting vegetables over 12 weeks had lower blood pressure and blood sugar.It's also important to consider which parts of the plant you're eating，says Yeh. "The nutritional values for cabbage and turnip （大頭菜） aren't that similar because one is the leaf and the other one is the root part of the plant，" she says.
（1）What else makes the Mediterranean diet healthy besides its rich content？
C
C
A．Its easy availability.
B．Its appealing colors.
C．Its ways of cooking.
D．Its easily being absorbed.
（2）What's a good way to get nutrients and phytonutrients from a diet besides color？
A
A
A．Paying attention to taste.
B．Eating all parts of a plant.
C．Eating seasonally and locally.
D．Combining different diets every day.
（3）How does the author develop the text？
B
B
A．By listing health benefits of the rainbow diet.
B．By providing viewpoints of different experts.
C．By explaining the processes of related studies.
D．By introducing the popularity of the rainbow diet.
（4）What might be the best title for the text？
D
D
A．What colorful food is the healthiest？
B．How should we eat colorful food in life？
C．Where can we get healthy colorful food？
D．Why is eating colorful food good for you？
