What kind of diet is healthy? We know that a healthy diet should include (包括) grains, fruits and vegetables, protein (蛋白质) foods, sugar, salt and so on.

About one-fourth of your diet should have foods from the grains, such as corns, whole grain bread, whole grain cereals (麦片粥), brown rice, and whole grain noodles. Half your diet should be filled with fruits and vegetables. You need to choose them from fresh first. Fresh fruits and vegetables provide vitamin C and other nutrients (营养成分) to us. Another one-fourth of your diet should be protein foods like beef, chicken, fish, beans, eggs, nuts (坚果) and milk. Among above protein foods, beans and nuts are from plants. What’s more, some sugar and salt are also necessary to our health. But we’d better eat less sugar and salt.

After knowing what a healthy diet is, have you learned how to make healthy food choices? Let’s make an effort to have a healthy diet and keep fit.

What is health? “Health” means eating well, getting enough exercise, and having a healthy weight. Let’s read the following rules. 【小题1】

Eat different kinds of foods, especially fruit and vegetables. We all know that eating fruit and vegetables can help us stay healthy, 【小题2】 Remember that we can only get the nutrition (营养) we need by eating different kinds of foods, especially fruit and vegetables.

Drink water and milk more often. Besides water, kids need plenty of calcium (钙) to grow strong bones (骨头), and milk is rich in it. Every day, you should drink at least three cups of milk when you are 9 years old or older. You should also try to have less sugary drinks. 【小题3】

Listen to your body. When you are eating, notice how your body feels. 【小题4】 Eating too much makes you feel uncomfortable.

Limit (限制) screen time. What’s screen time? It’s the time you spend watching TV, movies and playing computer games. The more time you spend on these sitting-down activities, 【小题5】 Try to spend more time on sports every day.

How far can scientists let their curiosity go? The Ig Nobel Prize, a spoof (滑稽模仿) of the prestigious (权威的) Nobel Prize, exists to award unusual or unimportant achievements in scientific research.

The awards are given every year to the 10 strangest research projects of the year. It is to "honor achievements that first make people laugh, and then make them think"

On September 12, the 2019 winners of the Ig Nobel Prize were announced. Here are three of them.

Medicine Prize: Pizza

It's one of the world's most popular foods. but what if we told you that a pizza can protect you against illness and death? According to the Ig Nobel Medicine Prize winner, eating more pizzas can lower the risk of cancer and heart disease---if your pizza is filled with fruits and veggies. These provide flavonoids (类黄酮) to fight against certain diseases. So, if you're a pizza enthusiast, you now have one more reason to love it!

Economics Prize: Dirty Money

As one of the most frequently passed items on the planet, paper money is known to pick up all kinks of bacteria (细菌). Which country's money is the dirtiest? To find the answer, an international team of scientist compared seven countries' paper money. They found that the notes including more polymer (聚合物) specifically the Romanian Leu carry more drug-resistant pathogens (病原体). Perhaps this will make cashless payments popular.

Biology Prize: Cockroach(蟑螂)

Cockroaches are well known for their survival abilities, but few people know they can sense magnetic (磁性的) fields. More surprisingly, an international team found that dead cockroaches have more magnetic properties (特性) than live ones. That's because magnetic properties drop when the temperature gets higher.

So if you can stand cockroaches, they may be good magnetic sensors.