When taken at face value, diet soda seems like a health-conscious choice. It saves you the 140-plus calories you’d find in a sugary soft drink while still satisfying your urge for something sweet with artificial sweeteners like aspartame, saccharin, and sucralose.
But there’s more to this chemical cocktail than meets the eye.
1. It confuses your body
Artificial sweeteners have more intense flavor than real sugar, so over time products like diet soda dull our senses to naturally sweet foods like fruit, says Dr. Brooke Alpert, author of The Sugar Detox.
Even more troubling, these sugar stand-ins have been shown to have the same effect on your body as sugar. “Artificial sweeteners trigger insulin, which sends your body into fat storage mode and leads to weight gain,” Alpert says.
2. It could lead to weight gain, not weight loss
Diet soda is calorie-free, but it won’t necessarily help you lose weight. Researchers from the University of Texas found that over the course of about a decade, diet soda drinkers had a 70 percent greater increase in waist circumference compared with non-drinkers.
And get this: participants who slurped down two or more sodas a day experienced a 500 percent greater increase.
The way artificial sweeteners confuse the body may play a part, but another reason might be psychological, says Minnesota-based dietitian Cassie Bjork. When you know you’re not consuming any liquid calories, it might be easier to justify that double cheeseburger or extra slice of pizza.