Why do we eat fast food if it's bad for us?

A combination of lazyness, and convenience. Fast food outlets are nearly on every street corner, and requires absolutely no effort. I used to believe that addiction was also a reason, and it probably is to a degree, but not as much as I used to, as I have given up eating fast food without any problems.

Fast foods are there for people who say they are very busy.  They are too lazy to prepare a nutritious  meal.  It is also for convenience.  If people take time to prepare healthy food, we won't see a lot of obese people here in America.  These fast food cause higher cholesterol level, hypertension which eventually causes stroke.

Convenience, mainly...plus laziness...too lazy to prepare good, nutritional, food...

Hi Rose.  I can answer this by saying that soooo many tasty foods and drinks are bad for us these days!.. and I think Profitbob hit on a good point,.. Addiction!   I heard an amazing story years back, when Fast Food was becoming a booming business.  This may seem far-fetched to some, but personally I wouldn't doubt this is true;.. that our own Government is behind allowing to add addictive ingredients.. in the same way they do Cigarettes, to get people 'hooked'. 

The reason is to keep Americans dull-minded and tired out.. (which we all know Fast Food does), putting us in a position to just go with the flow, lacking a healthy thought process and motivation to come up against anything our Government does, or forces us into doing! (PASSIVE ACCEPTANCE). And as you can see, it's working!  Most people know that Good Nutrition is extremely important for a strong healthy mind, but yet choose not to care anymore.  I don't know about you, but that makes me suspicious, and completely believe the story I heard so long ago.

Kiwiguy, and other strong-willed people can kick addictions, especially when they learn about all the horrible side-effects, but most of us like to believe we're invincible, and think that nothing bad will ever happen to us!  Or maybe we say 'hey, we're gonna die anyway, why not indulge?  Whatever this is, it's deadly.

I know what you mean, it's almost like; what is going on?  Do people have some sort of death wish?  Like Dogbreeder said, heart attacts, obesity etc.. tired laziness.  What's wrong with us?  It baffles the mind of anybody who has an ounce of common sense. Anyone who cares about their long term mental and physical health, their abilities to change things for the better and stay sharp. 

 This was a great question. Take Care of yourself.

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well, most people fall in love with fast food. It becomes an addiction like smoking. to stop from eating this food, start making substitutes like a turkey burger.

yeah but sugars and carbohydrates are more addicting, that's what people should really focus on. Doesnt make much sense though because our bodies dont have any notible hormones or whatever that can make us "addicted to fat"....I sure never had withdrawl when going on a fruit and vegetable fast (hard core carnivore here) but what i really craved was doughnuts, but no problem with the fat part, This is coming from someone who eats nothing but eggs, cheese and bacon, and chicken (And proudly thin cuz of it) :) oh and i majored in nutrition :)  no mean to brag

I had a psychology professor who said that fat was an addictive substance, more addictive than most drugs.