Diet sodas are carbonated beverages.

Instead of sugar, they are sweetened with artificial sweeteners like aspartame, cyclamate, saccharin, acesulfame-k or sucralose.
These drinks are calorie free, which technically should help people lose weight and prevent sugar-related diseases like metabolic syndrome and diabetes.
However, the evidence for these beverages having any use is completely nonexistent.
Diet Soda and The Metabolic Syndrome
The metabolic syndrome is a group of risk factors for disease that often occur together and raise your risk of diabetes, stroke and heart disease.
It is defined as having at least three of the following:
  • Abdominal obesity (belly fat)
  • High fasting glucose
  • High triglycerides
  • Low HDL cholesterol
  • Elevated blood pressure
Drinking “calorie free” beverages instead of sugary ones does not appear to be helpful against the metabolic syndrome.
In a study published in the journal Circulation in 2008, which followed 9,514 people for 9 years, drinking artificially sweetened beverages was associated with a 34% greater risk of developing the metabolic syndrome.
Another study found a 36% increased risk of metabolic syndrome and a drastically increased risk of diabetes in diet soda drinkers.