What can you do to stay in good health when you travel? There are a few things you should remember.

A holiday should be a way to relax, but very often it’s not. You may spend most of your time traveling to so many places. This can be very exhausting, and you may have a terrible headache (头痛) after a few hours. Remember you will get sick easily if you are very tired. When traveling, you should sometimes sit down for a few hours in a nice place.

Enough sleep is also important during(在……期间) your trip. If you have trouble sleeping at night, don’t be afraid to change (变换) rooms or hotels. If you want to stay out late at night, be sure to sleep for an hour or two during the day.

Finally, good eating is necessary when you travel. To stay healthy, you should eat different kinds of food and be careful about how much you eat. Too much food is not good for you.

Salted fish is a common food that is popular in the south of China. It is chewy (有嚼劲的) and adds a salty taste to other dishes. But eating too much salted fish can give you cancer (癌症), according to a list of cancer-causing foods that was recently published by the China Food and Drug Administration.

Salted fish is produced with a large amount of salt, which later turns into nitrites (亚硝酸盐).When nitrites reach our stomach, they turn into another kind of chemical (化学物质) that can cause cancer, Huang Yufang from the Cancer Center of Guangzhou Medical University told Xinhua News Agency.

So does this mean we can’t eat salted fish anymore?

“People don’t need to worry too much. It has to do with how often you eat certain foods and how much of them you eat,” Huang said. If you really like eating salted fish, you can eat a small amount once or twice a month. At the same time, you should also eat more fruit and vegetables that are rich in vitamin C, as this can help to prevent the formation (形成) of nitrites.

In fact, there are many foods we often eat that are thought to cause cancer, such as pickles (咸菜), areca palm (槟榔), certain fried foods and even red meat, such as pork, lamb and beef.

Although these foods can possibly cause cancer, it doesn’t mean a person will get cancer just from eating them, according to the World Health Organization.

Cancer is caused by many different factors, such as one’s genes (基因), environment, lifestyle and eating habits. As long as one has a balanced diet, one doesn’t need to avoid cancer-causing foods totally, Fang Yu, a doctor from the Beijing Cancer Hospital, told People’s Daily.

If you eat junk food, you can't really expect to grow up strong and healthy. But if you eat healthy food, you may do so. So how can we know which food is healthy? Unluckily, a lot of food looks good but it isn't really good, because it contains things that are bad for both your health and the environment (环境). Where are the things from? This is all to do with how people make food: growing it on the farm, processing (加工) it in factories, storing it and making it ready for you to eat.

Here's what happens:

Most farmers use chemicals (化学品) to stop their crops from getting sick. Many of these chemicals are kept in the food you eat. Some people believe that this may make people get illnesses. The chemicals may also pollute water and air, and kill lots of animals.

Waste from farm animals brings a lot of pollution. Some of the waste gets into the water.

Planes used by people to move food and drinks around also pollute the air.

Most things that you drink, like cola, taste good, but something in them, including sugar, may be bad for your health. Sugary drinks make you fat and are bad for your teeth.

What you can do:

If you can, try and get organic (有机的) food. Organic food doesn't harm the environment. Animals kept on organic farms are treated (对待) more kindly than the ones on factory farms.

Eat fresh food whenever you can and cook at home. Don't eat out too much. Cooking can be fun!