Junk foods!

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Hey there everyone. I'm not sure about you but I like junk foods so much. I like their taste even though they are junk. I hope the bad tasting foods like some vegetables were the junk foods and the good tasting ones the healthy ones. But I have a question. Is Burger a junk food? Isn't burger meat, bread, lettuce, tomato and cheese? If burger is a junk food than I probably don't really know the meaning of the word 'junk food' can you tell me what it is?