1.food that tastes good but is high in calories having little nutritional value
definition of Wikipedia
junk food (n.)
Junk foods typically contain high levels of calories from sugar or fat with little protein, vitamins or minerals. Common junk foods include salted snack foods, gum, candy, sweet desserts, fried fast food, and carbonated beverages. 
A study by Paul Johnson and Paul Kenny at the Scripps Research Institute (2008) suggested that junk food consumption alters brain activity in a manner similar to addictive drugs like cocaine or heroin. After many weeks with unlimited access to junk food, the pleasure centers of rat brains became desensitized, requiring more food for pleasure. After the junk food was taken away and replaced with a healthy diet, the rats starved for two weeks instead of eating nutritious fare. A 2007 British Journal of Nutrition study found that mothers who eat junk food during pregnancy increased the likelihood of unhealthy eating habits in their children.
A report published in the Journal of the Federation of America suggests that babies of mothers with a high-sugar and high-fat diet while pregnant are more prone to junk food themselves. The study was conducted on rats and suggests that "infants whose mothers eat excessive amounts of high-fat, high-sugar junk foods when pregnant or breastfeeding are likely to have a greater preference for these foods later in life."
A 2008 report suggests that mothers who eat junk food while pregnant or breast-feeding have children who are more prone to obesity. The children are also more prone to type 2 diabetes, raised cholesterol, and high blood fat.
To reduce unhealthy foods, in December 2011 Denmark has introduced the first fat-food tax in the world by imposing a surcharge on foods that contain more than 2.3 percent saturated fat. Hungary has also imposed a tax on packaged foods that contain unhealthy concentration, such as beverages containing more than 20 mg of caffeine per 100 ml.
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