Why are junk foods so hard to resist?

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If you are one of those people aiming for a healthy diet, cutting out junk foods is a good place to start. Although, this is sometimes easier said than done! It is not that we always lack willpower or motivation to eat healthily. But what is it that keeps drawing us back time and again to that bag of chips or chocolate bar? It is like the popular advertisement - No one can eat just one!