An article or views upon obesity - a health hazard(role of junk food,coke culture)?

Coke is a solid carbonaceous material derived from destructive distillation of low-ash, low-sulfur bituminous coal. The volatile constituents of the coal, including water, coal-gas and coal-tar, are driven off by baking in an airless oven at temperatures as high as 1,000 degrees Celsius so that the fixed carbon and residual ash are fused together. Most coke in modern times are produced in "by-product" coke ovens, such as the upper photograph, and the resultant coke is used as the main fuel in ironmaking blast furnaces. Originally, the by-product was the coke and the gaseous and liquid hydrocarbons driven off during cokemaking were the sought-after products. Today, the hydrocarbons are considered the by-products of modern cokemaking facilities (though they are usually captured and used to produce valuable products). Non-byproduct coke oven facilities, such as the lower photograph, burn the hydrocarbon off-gases on site to provide the heat needed to drive the carbonization process.

Coke oven at smokeless fuel plant, South Wales
The Illawarra Coke Company (ICC) in Coalcliff, New South Wales.Contents [hide]
1 Properties and usage
2 History
3 Other coking processes
4 References
Junk food is a term describing food that is perceived to be unhealthy or having poor nutritional value. The term is believed to have been coined by Michael Jacobson, director of the Center for Science in the Public Interest, in 1972.[1]. The term has become common usage amongst many different groups over the years, including opponents of fast food industries and environmentalists. Junk food typically contains high levels of fat, salt or sugar and numerous food additives such as monosodium glutamate and tartrazine; at the same time, it is lacking in proteins, vitamins and fiber, among others. It is popular with suppliers because it is relatively cheap to manufacture, has a long shelf life and may not require refrigeration. It is popular with consumers because it is easy to purchase, requires little or no preparation, is convenient to consume and has lots of flavor. Consumption of junk food is associated with obesity, heart disease, Type 2 diabetes and dental cavities. There is also concern about the targeting of marketing at children.

Contents [hide]
1 What is a junk food?
2 Effects
3 Marketing
4 See also
5 Notes