Coke Zero vs. Diet Coke: Flavor, Nutrition, Benefits, and Downsides

Both Coke Zero and Diet Coke are marketed as being free of sugars and calories, but there are a few differences:

Flavor

The main difference between Coke Zero and Diet Coke is the flavor. Coke Zero is nearly identical to Coca-Cola Classic because it uses the same flavor bases.  Diet Coke has a distinct flavor due to its unique combination of flavor bases. 

Caffeine 

Coke Zero contains less than Coke Zero and Diet Coke.

Sweetener 

Coke Zero contains aspartame and acesulfame potassium as sweeteners, while Diet Coke uses only aspartame.

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Although both Coke Zero and Diet Coke do not contain sugar, one is not necessarily healthier than the other.

Health experts do not recommend drinking soda on regular basis, since soft drinks have no nutritional benefits.

However, if you are trying to lose weight or have diabetes, these sugar-free versions are better than drinking original Coke.

Aspartame

Aspartame is the artificial sweetener added to both Coke Zero and Diet Coke. Studies have suggested that aspartame may cause headaches or other negative health effects. 

Studies have also suggested that acesulfame potassium, another sweetener, may be carcinogenic. However, more studies are needed.

Phosphoric acid

Phosphoric acid is an inorganic mineral acid used as a preservative in processed foods and beverages such as soda. It not only extends shelf life but also adds some acidity.

Although research on the health effects of phosphoric acid is limited, a study reported a link between phosphoric acid-containing sodas and a decrease of bone mineral density in the hips of the participants.

Another study found that consuming phosphoric acid-containing sodas may increase the amount of acid in the blood, increasing the risk of kidney disease.

Caramel coloring

That trademark caramel-brown hue of Coke is made from ammonium compounds, which degrade to yield 4-methylimidazole or 4-MEI.

One study suggested that one of the dangers of Diet Coke consumption is regular exposure to 4-MEI, which can increase the risk of some forms of cancer. 

On its website, Coca-Cola claims that it has cut the levels of 4-MEI in its drinks, but that they still contain trace quantities of the substance.

Dental cavities

Soda consumption has been linked to dental cavities and poor bone health. Therefore, it is best to avoid or limit consumption.

Thyroid dysfunction

The fluoride content in soft drinks is associated with thyroid abnormalities. If you have known thyroid diseases, polycystic ovary syndrome, or are pregnant, you should avoid such beverages.

Sparkling water: More and more people have become aware of the health dangers of sodas such as Coke Zero and Diet Coke, leading many to opt for flavored sparkling water instead.

Kombucha: Although its bitter flavor may not be to everyone's taste, kombucha contains little to no sugar and has the added advantage of probiotics, which are believed to aid gut health.