To make their junk food tasty they use all the low quality ingredients in excessive amount. And that excessive amount of low quality ingredients used in making of junk food is the reason because of which you have to suffer from different kind of dangerous life threatening diseases in your life. It is also a reason because of which your stomach and digestive system hate to eat junk food as it is very difficult for your digestive system to digest those low quality ingredients in excessive amount in the form of junk food. But at the same time due to its amazing taste your tongue loves to loves to eat junk food.