Do you ever think that a lot of science goes in making your burger and French fries attractive?
The more your mouth waters at the sight of your favourite fast food, the more you will crave for it. Fast food is designed to make certain impressions on your brain. Your brain thinks that the food is yummy but it does not fill up your tummy. It makes you crave for more of it. It is the psychobiology of junk food. A good reason to stay away from junk food. Moreover, it's a known fact that too much of junk food leads to high blood pressure, depression and high cholesterol.