Fatty foods....Why do they taste so good?

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Any ideas? I was talking to my friend yesterday and asked her what makes people over indulge in foods which are full of sugars, fats and carbohydrates? They tend to be the nations favourite foods, where busineses which produce/ sell such products make a fortune. We have chips, crisps, chocolates, cakes, pizzas, biscuits, and take aways to name but a few. Why can a celery stick not taste as great as a mars bar (lol)?