It's normal to long for the taste of potato chips or a cheese –covered pizza. Even though they're full of calories, eating them occasionally won't do much harm. However, according to the new numbers, young people are becoming more gluttonous. The BBC's Good Food Nation Survey showed that on average, 16 to 20-year-olds ate fast food at least twice a day in the UK. So what's behind this fast food binge (狂热).

WebMD, an online publisher of news and information of human health and well-being, surveyed nearly 600 teenagers and adults in the United States. They found that the most common reason was our busy lifestyle. More than 92.3 percent of respondents said they were too busy to cook. Many find it challenging to balance work and life, and the convenience of fast food meets their needs. Fast food is readily available in corner stores and vending machines (自动售货机).

Remember those instant noodle cups from the supermarket? They're ready in minutes, and you can store them at home for a long time.

But many people think this trend does no good. Sarah Toule, head of health information at World Cancer Research Fund, told the BBC: "It's frightening that people, especially younger generations, are eating so much fast food loaded with fat, sugar and salt, but offers little nutritional value."

She added, "Especially high in calories, fast food leads to unhealthy weight gain – which in turn increase the risk of 11 cancers later in life.

So what is the right thing to do? Toule suggested that young people should prepare meals in advance and learn to include the different food groups in their diets.