Why do you eat fast food?

let’s face it-Everyone Does love the fast food! but this food is unhealthy or having poor nutritional value .Junk food contains high levels of fats,salt, many additives.i know its hard to control our food cravings (i for one sure CAN’T),i eat a lot of ( Candy + Chips + Soda + Ice Cream + Cookies + Etc . ].why these foods are so addictive ?and why do become so popular? is it true that pizza is always better and healthier than deep fried fries and chicken?