
While many people are divided on their preference for Coke or Pepsi, the debate also extends to diet versus regular soda. With increased awareness of caloric intake, some people opt for diet soda to reduce their liquid calories. However, the question remains whether diet soda is a healthier alternative. Regular soda typically contains a high amount of sugar, with 10 to 11 teaspoons in a 12-ounce can, exceeding the recommended daily sugar intake. Diet sodas, on the other hand, use sugar substitutes like aspartame, acesulfame potassium, sucralose, and stevia, which are considered non-nutritive. So, does Diet Pepsi, a popular diet soda option, contain corn syrup?
Does Diet Pepsi have corn syrup?
| Characteristics | Values |
|---|---|
| Corn syrup | Diet Pepsi does not contain corn syrup. It is a zero-calorie drink and uses sugar substitutes such as aspartame, acesulfame potassium, sucralose, and stevia. |
| Health | Most health care providers would not recommend drinking diet sodas. However, drinking diet soda is better than drinking regular soda as it helps to decrease the amount of sugar in your diet. |
| Competition | Diet Pepsi's principal competing product is Diet Coke. |
| Rebranding | In 2012, Diet Pepsi changed its sweetener to sucralose ahead of a major rebranding of the soft drink in 2013. |
| Flavors | Diet Pepsi has introduced variations with additional flavors such as wild cherry, vanilla, lemon, and lime. |
| Caffeine-free | A caffeine-free version of Diet Pepsi is also produced. |
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What You'll Learn

Diet Pepsi's sweetener change in 2013
Diet Pepsi is a diet carbonated cola soft drink produced by PepsiCo and introduced in 1964 as a sugar-free variant of Pepsi. The drink was first test-marketed in 1963 under the name Patio Diet Cola and was rebranded as Diet Pepsi the following year.
The original sweetener used in Diet Pepsi was saccharin, an artificial sweetener. However, in 1983, the sweetener was changed to aspartame, marketed as the brand NutraSweet. This change was made due to concerns over the safety of saccharin that emerged in the 1970s.
In 2012, PepsiCo once again quietly changed the sweetener in Diet Pepsi ahead of a major rebranding of the soft drink. This time, the company added acesulfame potassium to the existing aspartame, creating a mix of two artificial sweeteners commonly found in newer diet sodas. This change was made to improve the drink's consistency and prevent the taste from degrading over time.
The sweetener change in 2012 was not explicitly communicated in the drink's advertising campaigns, and the new mix was gradually rolled out as shelf space cleared.
While the specific year of the sweetener change is not mentioned, it is likely that the change occurred in 2012 or early 2013, as the news articles discussing the change are from December 2012, and the new mix was said to be gradually rolled out over time.
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Aspartame formulation
Aspartame is an artificial non-saccharide sweetener commonly used as a sugar substitute in foods and beverages. It is made of amino acids found naturally in fruits and vegetables. It is 180 to 200 times sweeter than sucrose (table sugar) and has a unique sweet taste profile that matches that of sugar, with no bitter aftertaste. This means that only a very small amount of aspartame is required to achieve the same level of sweetness as sugar, resulting in a negligible caloric contribution.
Aspartame is often blended with other artificial sweeteners such as acesulfame potassium or saccharin to produce an overall taste more like that of sugar and to improve its stability. The stability of aspartame can also be enhanced by encasing it in fats or maltodextrin. It has a long history of use, with over 35 years of history, and is one of the most thoroughly tested ingredients in the food supply, having been approved by health and regulatory authorities in over 130 countries, including the US Food and Drug Administration (FDA), Health Canada, Mexico COFEPRIS, the European Food Safety Authority (EFSA), and the Japanese Ministry of Health and Welfare.
The acceptable daily intake (ADI) value for aspartame, defined as the amount that can be ingested daily over a lifetime without appreciable health risk, has been determined by various organizations. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) and the European Commission's Scientific Committee on Food (later EFSA) set the value at 40 mg/kg of body weight per day, while the FDA has set it at 50 mg/kg per day. Reviews of consumption patterns across multiple countries have found that intake levels are well below the ADI for safe consumption.
Despite its widespread approval and use, aspartame has faced some scrutiny. In 2023, the World Health Organization (WHO) released guidelines recommending against the use of non-nutritive sweeteners to control body weight or reduce the risk of non-communicable diseases. Additionally, aspartame was classified as a group 2B agent by the International Agency for Research on Cancer (IARC), indicating that it is possibly carcinogenic to humans. However, it's important to note that aspartame has been extensively studied, and the majority of regulatory bodies have found it safe for consumption within the normal acceptable daily intake limit.
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Diet Pepsi Classic Sweetener Blend
The consumption of diet soda is a topic of debate in the healthcare industry. While it is a way to reduce sugar intake, it may not be the healthiest option. Regular soda typically contains 10 to 11 teaspoons of sugar per 12-ounce can, which far exceeds the recommended daily sugar intake. As a result, many people have shifted towards diet soda, which uses sugar substitutes like aspartame, acesulfame potassium, sucralose, and stevia.
In the case of Diet Pepsi, the formulation has changed over the years. Initially, the soda was sweetened with the artificial sweetener saccharin. However, in 1983, concerns over saccharin led to a shift to aspartame, which is marketed as the brand NutraSweet. In 2013, Diet Pepsi changed its sweetener to sucralose ahead of a major rebranding. This new formula received backlash from consumers, leading Pepsi to revive its aspartame formulation as the "Diet Pepsi Classic Sweetener Blend" in 2016. This blend was sold alongside the new formula, and in 2018, PepsiCo reverted Diet Pepsi's sweetener back to aspartame market-wide.
The availability and ingredients of Diet Pepsi vary by country. In the United States, it is marketed as having zero calories, and its ingredients include carbonated water, caramel color, aspartame, phosphoric acid, potassium benzoate, caffeine, citric acid, natural flavor, acesulfame potassium, and phenylketonurics. In Canada, the ingredients are similar, with some variations in the listed amounts and the use of sodium benzoate instead of potassium benzoate. In the United Kingdom, the formulation includes carbonated water, caramel colour, flavourings (including caffeine), phosphoric acid, sweeteners (aspartame and acesulfame K), acidity regulator (sodium citrate), preservative (sodium benzoate), citric acid, and a source of phenylalanine.
While Diet Pepsi Classic Sweetener Blend does not contain high-fructose corn syrup, it is important to note that the consumption of diet soda and artificial sweeteners is still a subject of discussion among healthcare professionals.
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PepsiCo's reversion to aspartame
PepsiCo's decision to revert to using aspartame in its products is a notable shift, given the company's previous removal of this artificial sweetener. This move was announced in 2016, a year after PepsiCo had discontinued the use of aspartame in its Diet Pepsi range in the United States. The initial removal of aspartame was driven by consumer concerns about artificial sweeteners and their impact on health.
The reintroduction of aspartame was part of PepsiCo's strategy to revive declining cola sales, particularly with the launch of "Diet Pepsi Classic Sweetener Blend." This new product, sweetened with aspartame, aimed to cater to consumers who preferred the taste of aspartame-sweetened drinks. At the same time, PepsiCo also rebranded "Pepsi Max" as "Pepsi Zero Sugar" to emphasize its status as a diet drink.
It's worth noting that aspartame is a highly potent sweetener, approximately 200 times sweeter than regular table sugar. While it offers the benefit of being zero-calorie, its usage has sparked debates and concerns about its potential health effects. In 2023, the International Agency for Research on Cancer (IARC), affiliated with the World Health Organization (WHO), classified aspartame as "possibly carcinogenic to humans."
Despite this recent development, PepsiCo has stated that it does not intend to make immediate changes to its product portfolio. The company's Chief Financial Officer, Hugh Johnston, emphasized the weight of scientific evidence suggesting that aspartame is safe. He also highlighted the ease with which they could shift to other sweeteners if necessary, given their diverse range of products.
This reversion to aspartame by PepsiCo reflects the company's response to market demands and consumer preferences. By offering a choice between aspartame-sweetened and alternative sweetener options, they aim to cater to varying taste preferences and health considerations among their customers.
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Concerns about aspartame consumption
Aspartame is an artificial sweetener used in many foods and drinks. It is a common sugar substitute in diet soda. While aspartame has an acceptable daily intake (ADI) of 40 milligrams (mg) per kilogram (kg) of body weight, there are still concerns about its consumption.
One concern is the potential link between aspartame and cancer. The International Agency for Research on Cancer (IARC) has classified aspartame as a Group 2B agent, indicating that it is possibly carcinogenic to humans. However, the Joint Expert Committee on Food Additives (JECFA) and the World Health Organization (WHO) have reaffirmed the ADI of 40 mg/kg, stating that the evidence of an association between aspartame consumption and cancer in humans is not convincing. Nonetheless, IARC and WHO continue to monitor new evidence and encourage independent research in this area.
Another concern is the effect of aspartame on the nervous system. Some research suggests that long-term use of aspartame may increase the risk of neurodegenerative disorders and may adversely affect the sciatic nerve in the lower back. Additionally, aspartame has been associated with an increased risk of heart disease and stroke.
Aspartame may also be unsafe for people with phenylketonuria (PKU), a genetic metabolic disorder that affects the body's ability to process phenylalanine, one of the amino acids that make up aspartame. People with PKU must avoid or limit their intake of phenylalanine, and all products containing phenylalanine in the United States carry a label to inform consumers.
Furthermore, there are mixed findings regarding the impact of aspartame on weight loss. While it is often marketed as a low-calorie alternative to sugar, some research suggests that aspartame may increase appetite and affect metabolism, potentially contributing to obesity. A study on rat dams and their offspring found that consumption of aspartame during lactation and gestation increased obesity in male offspring and had a detrimental effect on glucose and insulin tolerance.
In conclusion, while aspartame has an established ADI that is generally considered safe, there are ongoing concerns about its potential health effects, including its links to cancer, neurodegenerative disorders, heart disease, and stroke. More research is needed to fully understand the impact of aspartame consumption on human health.
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Frequently asked questions
No, Diet Pepsi does not contain high fructose corn syrup. It contains artificial sweeteners such as aspartame, acesulfame potassium, sucralose and stevia.
Regular Pepsi contains sugar, while Diet Pepsi contains artificial sweeteners.
Carbonated water is the primary ingredient in Diet Pepsi, followed by caramel colour, phosphoric acid, caffeine and other ingredients.
In the United States, Diet Pepsi is marketed as having zero calories. However, according to FDA guidelines, products with fewer than five calories per serving can be labelled as containing "zero calories".










































