Scientists learned a lot about the kinds of food people need. They say that there are several kinds of food. People should eat them every day.

People in different countries and different places in the world eat different kinds of food. They cook and eat food in different ways, too. People in different countries also eat at different times of the day. In some places people eat once or twice a day. In other countries people eat three or four times a day. Scientists say that none (没有一个) of the differences is really important. It doesn’t matter whether food is raw or cooked, cool or hot. It doesn’t matter whether a person has dinner at four o’clock in the afternoon or at eleven o’clock at night. The important thing is what you eat every day.

There are two problems in feeding (养活) the people on the earth. The first is to find enough food to feed the world’s people so that no one is hungry. The second is to make sure that people everywhere have the right kinds of food to make themselves strong and healthy.

When things get wildly busy in the morning, some people don’t have breakfast in order to save time. But that may be a big mistake for students. Whether at home, on the way to school or at school, eating something healthy for breakfast may help a student get better grades.

Researchers looked at 5,000 9-to-11-year-olds from more than 100 primary schools in the UK. They looked at what the students ate for breakfast and then their grades. And 6 to 18 months later, they found that the students who ate a healthy breakfast were twice as likely to perform above average in educational activities. The researchers also found that unhealthy breakfasts—such as potato chips or a donut did not appear helpful to educational performance. In 2013, an organization in the United States, also looked at possible connections between breakfast and students’ success in school. They found that on average students who ate breakfast provided by their school attended 1.5 more days of school per year. These students also scored 17.5 percent higher on standardized math tests.

Health experts suggest that the best breakfast is a mix of complex carbohydrates (碳水化合物), protein and fat. This gives your body the energy it needs to think clearly and to remember what it learns. Wholegrain bread is an example. The report explains that the brain needs glucose (葡萄糖) to work well. Simply eating a breakfast rich in carbohydrates may make a student tired. So, adding protein helps to prevent fatigue (疲劳). Having a protein such as milk, yogurt, eggs or meat can help students to feel full longer. Oatmeal (燕麦片), the researchers say, is an example of a breakfast that is rich in fiber and protein. It releases energy slowly because it is a wholegrain food. So, students will feel full longer.

Health experts also suggest not eating too much for breakfast. This can also make a person feel tired and unable to think clearly. They say eating between 350 and 500 calories in the morning is a good amount of energy to start the day.