The calcount Team

Diet Coke vs. Coke No Sugar

Since both Diet Coke and Coke No Sugar are sugar-free and contain less than one calorie, are they really different? Let’s take a closer look at both drinks to find out if so and which one is healthier.

Different Histories

Malcolm Fraser was the Prime Minister in 1982 when Diet Coke was launched. In 2017, Malcolm Turnbull was the Prime Minister when Coke No Sugar was released. Maybe Malcolms are good for low-calorie colas?

Diet Coke replaced the Coca-Cola company’s first-generation diet cola, named Tab. Coke No Sugar replaced Coke Zero in Australia and became Coke Zero Sugar in some other countries (not to be confused with Coke Zero).

coke zero became coke zero sugar
Coke Zero became Coke No Sugar

Diet Coca-Cola was launched hesitantly due to fears that customers would reject anything other than “the real thing” being called Coke. Up until 1982, there had not been another “Coca-Cola” besides the original since 1886. Diet Coke does not taste like regular Coke, but it became massively popular because people began taking calorie control seriously.

Diet Coke’s success led them to launch many other Cokes, like Cherry Coke, Coke Ginger and Coca-Cola With Energy. In 2005, they began to sell Coca-Cola Zero to appeal to people who wanted the regular Coke taste with the Diet Coke calories. They ran into a problem though: many people did not realise that Coke Zero was sugar-free, just like Diet Coke. In response, the company tweaked the recipe again and renamed the product to either Coke No Sugar or Coke Zero Sugar, depending on which market it is sold in.

Ingredients compared

The ingredients in both drinks are remarkably similar. This may come as a surprise to people who have tried both, because the two colas taste quite different. The key flavour differences are a company secret, but we can take a side-by-side look at the published ingredients:

Diet Coke compared to Coke Zero Sugar Coke No Sugar ingredients

The three major ingredient differences are that Diet Coke, compared to Coke No Sugar (or Coke Zero Sugar), has 1) more “Coke Secret Flavour” by volume, 2) a preservative (sodium benzoate), and 3) has citric acid instead of sodium citrate.

Why does Diet Coke need a separate preservative, whereas Coke No Sugar does not? Perhaps this is because the sodium citrate (Food Acid 331) and phosphoric acid (Food Acid 338) are sufficient to do the job, whereas the citric acid (Food Acid 330) and phosphoric acid combination in Diet Coke is not. Phosphoric acid, citric acid, and sodium citrate are all food acids which have a dual function of adding flavour and preserving the drink. Maybe the sodium citrate/phosphoric acid mix just works better?

Diet Coke has about 13mg of caffeine per 100ml, compared to about 10mg in Coke No Sugar.



Calories in Coke No Sugar

When it comes to calories, Coke No Sugar has a slight edge over Diet Coke: 0.33 calories per 100ml compared to 0.35 calories per 100ml. Most of the calories in both drinks probably come from the food acids. Bear in mind that at the level of less than one calorie per 100ml, both drinks may realistically be called zero calorie because the human body is going to draw no usable calories at that dilution.

If Diet Coke has more secret Coca-Cola flavour in it than Coca-Cola Zero Sugar, why does it taste less like classic Coca-Cola? Probably because there are different Coke flavour recipes, and Coke No Sugar’s version hits the mark closer than Diet Coke’s.

In Australia, both Coke No Sugar and Diet Coke are sweetened with Aspartame and Acesulfame Potassium. This sweetener blend is different in other countries.

Diet Coke Marketing

The flavour of Coke No Sugar is clearly different from Diet Coke by design. Coke No Sugar was introduced to appeal to the people who wanted a sugar-free Coke but did not want to drink Diet Coke.

The three main reasons for not wanting to drink Diet Coke are that:

1) it does not taste like the original Coke,

2) it has the word “diet” in it, therefore carries a certain social stigma, and

3) it is packaged in light colours and advertised as being “Coke-lite”, lending a certain airiness to the brand.

To overcome these reasons, Coke No Sugar

1) is remarkably close to the original Coke flavour,

2) does not feature the “D” word, and

3) is packaged in dark colours and advertised as being “proper Coke”, lending a certain heaviness/solidity to the brand.

Which is Healthier, Diet Coke or Coke No Sugar?

Diet Coke and Coke No Sugar
Tough choice?

Before answering the question, which is healthier, Diet Coke or Coke Zero Sugar, let us first and foremost acknowledge that neither are healthy! A quick rundown of the reasons why:

Aspartame may be Bad for You

Aspartame is one of the most intensely studied food chemicals in the world. It is a man-made chemical, first coming out of the lab in 1965. It then took over 15 years to gain regulatory approval by the FDA, mainly because many scientists just could not believe that it couldn’t have some sort of harmful effect! One of the biggest concerns was that the molecule in some ways looks like other molecules which cause brain tumours.

If you read the nutrition label of foods which contain aspartame, they will often include the warning “Contains Phenylalanine”. Phenylalanine is a by-product of aspartame and should be avoided by people with Phenylketonuria (PKU), especially pregnant women.

The other sweetener in both drinks, acesulfame potassium, is also 200 times sweeter than sugar and is also the subject of academic debate as to whether it causes cancer.

That said, many studies have shown that aspartame is harmless, even though many scientists today are still studying it closely. The jury is still out!

Carbonated Water might cause hunger

A study in 2017 showed that the carbon dioxide in carbonated water stimulates the release of ghrelin, the so-called “hunger hormone”. If true, this means that fizzy drinks make you want to eat more than you should.

Food Acid might weaken bones and teeth

Phosphoric acid, citric acid and sodium citrate have all been implicated in harmful effects on human teeth and bones. Older women who are at risk of osteoporosis should really avoid eating/drinking too many food acids.

Diet Coke compared to Coke No Sugar, choose which?

A side-by-side comparison of both products leads us to the conclusion that Coke No Sugar is the better choice. Coke No Sugar contains less sodium than Diet Coke (4.2mg/100ml compared to 15mg/100ml). It also contains less caffeine and it does not have any sodium benzoate in it. As a psychological bonus, Coke No Sugar contains fewer calories than Diet Coke.

Finally, it tastes better too!