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Junk food , fast food and street food are actually varies slightly from each others and you can't use those terms Interchangeably.
For instance, Junk foods are those foods which are easily accessible and needs very brief period of time to prepare and it also contains very minute amount of Nutritional values but contains higher amounts of Fat , Calories and sodium. as for example Chips, chocolate bar etc .
Where as Fast foods needs little time to prepare and which are served in restaurant. A junk food could also serve as a fast food.
e.g. KFC, McDonald's burger .
