The popular drink was first sold in 1886, with its exact recipe a closely-guarded secret.
"No reasonable consumer would assume that Diet Dr Pepper's use of the term 'diet' promises weight loss or management," a circuit court judge said in his ruling.
Such products might change the make-up of gut bacteria, scientists believe.
Poor diets can cause a child's teeth to go "mushy."
"Artificially sweetened beverages are often considered by the consumers as safe alternatives to sugary drinks since they provide very few calories but their effects on long term health remain very uncertain," an expert told Newsweek.
Scientists combed through data on over 100,000 people for the study.
Camera crews at the US Open caught the act and it has since been doing the rounds on social media.
The company's CEO admitted it is "relatively uncommon" to change prices mid-year. But given the cost pressures, the company believes it is best for business.
Graphic images caused a 20% drop in consumers wanting to buy soft drinks in a new study.
Report published at the European Congress on Obesity in Vienna.
Surprisingly, diet sodas weren't associated with increased cancer risk.
The stuff in diet sodas has been linked to a variety of medical conditions, including weight gain.
The president has long wrestled with the idea of diet soda as an agent for weight loss.
Cheaper soda is likely to lead to higher rates of obesity, diabetes and cancer worldwide, according to a new report from the CDC and American Cancer Society.
The first large-scale tax of its kind appears to lower consumption of sodas and sugary drinks.
Soft drink companies pay scientists to positively portray their products.
A new study says that sugary drinks cause death through diabetes, heart disease and cancer