用英文说明junk food的信息

Junk food is a common term used for any food that is perceived to be unhealthy and has low or poor nutritional value. The phrase was coined by Michael Jacobson, director of the Center for Science in the Public Interest, in 1972. Examples of junk food may include, but are not limited to hamburgers, pizza, candy, soda and salty foods like potato chips and french fries.

A diet rich in junk food is not conducive to maintaining a balanced diet, as suggested by various government and non-profit health organizations. The term has been used by many different groups over the years including opponents of fast food industries and environmentalists.

Junk food nevertheless remains popular because it is relatively cheap to manufacture, easy to purchase, is convenient to consume, and has a lot of flavor because of its typically high fat, sodium, or sugar content. Its nutritional value is typically very high in empty calories. Junk food also may contain numerous food additives