Ashley Gearhardt: Fake flavors, real cravings create an addiction to processed foods

Many people love to eat ultra-processed foods. Think about those crispy French fries, or the delicious strawberry milkshake. Ultra-processed foods are heavily changed from their original form and made mostly in factories rather than kitchens. Instead of simple ingredients you might recognize—like flour, eggs, or milk—these foods often contain long lists of additives, preservatives, artificial flavors, and chemicals designed to improve taste, texture, and shelf life.

Ashley Gearhardt, a University of Michigan psychology professor, studies how addictive processes may drive overeating. She joins the Michigan Minds podcast to share her insights on the impact of these foods on a global level and what drives over-consumption.

"Many of those products are delivering these unnaturally intense and concentrated combos of rapidly absorbable carbohydrates and added fats," she explained. "That combination just does not exist in nature, and our brain never evolved to handle that amount of intense reward stimulation in a food."

But it doesn’t stop there. Gearhardt explains that the food industry uses special ingredients and descriptions to “wake up” your brain and make food taste more exciting. Scientists can create strong flavors—like something that tastes like a strawberry—even if there’s no real strawberry in it. For example, the Froot Loops cereal tastes fruity, even though they don’t actually contain fruit.

Many of these foods send signals to your brain that remind you of natural foods your body is wired to enjoy, but they’re actually made in factories using chemicals, she said.

When these intense flavors are combined with things like refined carbs and fats, they stimulate your brain even more. This can make you start craving those specific tastes. You might find yourself wanting the flavor of Coca-Cola, the spicy “burn” of Flamin' Hot Cheetos, or the sweetness of a strawberry milkshake.

"Because of this, people often keep going back to those foods and craving them again and again," she said.

Michigan Minds is produced by Greta Guest and hosted by Michigan News staff. Jeremy Marble is the audio engineer, and Hans Anderson provides social media animations. Listen to all episodes of the podcast.