Why We Crave Junk Food

Steven Witherly is a food scientist who has spent the last 20 years studying what makes certain foods more addictive than others. Much of the science that follows is from his excellent report, Why Humans Like Junk Food.
According to Witherly, when you eat tasty food, there are two factors that make the experience pleasurable.
First, there is the sensation of eating the food. This includes what it tastes like (salty, sweet, umami, etc.), what it smells like, and how it feels in your mouth. This last quality — known as “orosensation” — can be particularly important. Food companies will spend millions of dollars to discover the most satisfying level of crunch in a potato chip. Food scientists will test for the perfect amount of fizzle in a soda. These elements all combine to create the sensation that your brain associates with a particular food or drink.
The second factor is the actual macronutrient makeup of the food — the blend of proteins, fats, and carbohydrates that it contains. In the case of junk food, food manufacturers are looking for a perfect combination of salt, sugar, and fat that excites your brain and gets you coming back for more.
Here’s how they do it…

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