
Diet Pepsi is a zero-calorie, zero-sugar, carbonated soft drink produced by PepsiCo. It was introduced in 1964 as a sugar-free variant of Pepsi and was the first diet cola to be distributed on a national scale in the United States. Diet Pepsi's formula has undergone several changes over the years, including a switch from aspartame to sucralose in 2012, and then back to aspartame in 2018. The drink has also been produced in various flavours, including wild cherry, vanilla, lemon, and lime, and a caffeine-free version is also available.
| Characteristics | Values |
|---|---|
| Type | Carbonated soft drink |
| Brand | PepsiCo |
| Year Introduced | 1964 |
| Taste | Bold, light, crisp, refreshing |
| Calories | Zero |
| Sugar | Zero |
| Carbohydrates | Zero |
| Ingredients | Carbonated water, caramel color, aspartame, phosphoric acid, potassium benzoate, caffeine, citric acid, natural flavor, acesulfame potassium |
| Packaging | 12 fl oz cans, 24 pack |
| Variants | Wild cherry, vanilla, lemon, lime, caffeine-free |
| Competing Products | Tab, Diet Coke |
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What You'll Learn

Sweeteners: sucralose and aspartame
Diet Pepsi is a zero-calorie, zero-sugar, carbonated cola soft drink produced by PepsiCo. It was introduced in 1964 as a sugar-free variant of Pepsi. Diet Pepsi has undergone several reformulations over the years, with different sweeteners being used.
In December 2012, it was reported that Diet Pepsi would be changing its sweetener to sucralose ahead of a major rebranding in January 2013. This reformulation received mixed reactions, with some people expressing their dislike for the new formula on social media platforms such as Facebook and Twitter in 2015.
In response to the feedback, PepsiCo revived the use of aspartame in its formulation, releasing the "Diet Pepsi Classic Sweetener Blend" in the US market in September 2016. This version featured a teal background on its label and used the 2002 typography, with the caption "Classic Sweetener Blend". It was sold alongside the new formula with sucralose.
Aspartame is an artificial sweetener commonly used in food and beverage products as a sugar substitute. It is estimated to be about 200 times sweeter than sugar. Aspartame is a combination of two amino acids, aspartic acid, and phenylalanine, and has minimal calories.
Sucralose, on the other hand, is a zero-calorie sweetener that is created by replacing three hydrogen-oxygen groups on sucrose (table sugar) molecules with three chlorine atoms. This process results in an exceptionally sweet substance that is estimated to be about 400 to 700 times sweeter than sugar. Sucralose is often used in soft drinks, baked goods, and other products as it provides a longer-lasting sweet taste compared to other sweeteners.
In February 2018, PepsiCo announced plans to revert to using aspartame as the primary sweetener in Diet Pepsi, discontinuing the use of sucralose. This decision was likely influenced by consumer preferences and the desire to maintain the classic taste associated with Diet Pepsi.
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Flavours: wild cherry, vanilla, lemon, lime
Diet Pepsi is a zero-calorie soft drink that has been a popular choice for those looking for a sugar- and calorie-free alternative to regular Pepsi. Over the years, Pepsi has introduced a variety of different flavours to its diet range, including wild cherry, vanilla, lemon, and lime. These flavours offer a unique twist to the classic Diet Pepsi, providing a range of options to cater to different taste preferences.
Wild Cherry Diet Pepsi was introduced in 1988 and was the first flavour variation of Diet Pepsi. It offers a sweet and slightly tart twist to the original drink, with a distinct cherry flavour that is not overly artificial. This variety provides a unique option for those who enjoy the taste of cherries and want a break from the traditional cola flavour.
Vanilla Diet Pepsi, on the other hand, provides a smooth and creamy twist to the classic drink. Introduced in the early 2000s, it offers a subtle hint of vanilla that complements the cola flavour. This variety has been well-received by those who enjoy the taste of vanilla-flavoured drinks, providing a slightly sweeter option compared to regular Diet Pepsi.
Lemon and lime flavours have also been introduced to the Diet Pepsi range, providing a refreshing and tangy twist. The lemon flavour, introduced in 2005, adds a bright and citrusy note to the cola, while the lime variety, released in 2004, contributes a slightly more tart and crisp flavour profile. These options are ideal for those who enjoy citrus-flavoured drinks, offering a refreshing alternative to the classic Diet Pepsi.
These flavour variations of Diet Pepsi offer a unique and exciting experience for consumers, allowing them to explore different tastes while still enjoying the sugar- and calorie-free benefits of the original drink. Whether it's the sweet and tart cherry, the smooth and creamy vanilla, or the refreshing citrus notes of lemon and lime, these flavours provide a diverse range of options to cater to a wide range of taste preferences.
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Preservatives: sodium benzoate and potassium benzoate
Preservatives are added to food and drinks to prevent spoilage and extend their shelf life. Sodium benzoate and potassium benzoate are common preservatives used in many processed foods and beverages, including Diet Pepsi. These compounds belong to a class of preservatives known as benzoates.
Sodium benzoate, a sodium salt, is often used as a food preservative and is denoted by the E number E211. It effectively inhibits the growth of microorganisms and prevents food spoilage. It is commonly found in carbonated drinks, fruit juices, pickles, and condiments. The compound has a long history of safe use and is permitted by regulatory authorities worldwide, including the U.S. Food and Drug Administration (FDA).
Potassium benzoate, on the other hand, is a potassium salt with the E number E212. Like sodium benzoate, it is also widely used as a preservative in the food industry. Potassium benzoate helps prevent the growth of mould, yeast, and certain bacteria, keeping food products safe and prolonging their shelf life. It is commonly added to carbonated drinks, fruit juices, and other acidic foods.
Both sodium benzoate and potassium benzoate work by disrupting the metabolism of microorganisms, making them unable to survive and reproduce. This preservative property is essential in maintaining the quality and safety of food and beverage products. However, it is important to note that some people may have sensitivities or intolerances to these preservatives, so it is always advisable to check the ingredient labels and consult a healthcare professional if needed.
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Acids: phosphoric and citric
Phosphoric acid and citric acid are both types of acids commonly found in cola drinks, including Diet Pepsi. These acids are added to give the drink a tart or sour taste and to provide a preservative effect.
Phosphoric acid is a colourless, odourless phosphorus-containing acid that is also used in fertilisers and detergents. In food and drink, it is used as an additive to provide a sharp taste and to act as a preservative. Phosphoric acid is found in high quantities in cola drinks, contributing to their distinct flavour profile. It is also used in some bottled teas and fruit drinks, although in smaller amounts.
Citric acid, on the other hand, is a weak organic acid found naturally in citrus fruits, such as lemons and oranges. Citric acid adds a tangy, acidic flavour to foods and drinks and is commonly used as a natural preservative and antioxidant. Citric acid is present in many carbonated drinks, including Diet Pepsi, and is also used in sweets, ice cream, and other processed foods to add a sharp, tart taste.
Both phosphoric and citric acids are generally recognised as safe for consumption by the FDA. However, excessive consumption of phosphoric acid has been linked to decreased bone density and increased risk of kidney problems. Citric acid, while considered safe, can cause tooth erosion if consumed in very high quantities. Therefore, it is important to enjoy Diet Pepsi and other acidic drinks in moderation as part of a balanced diet.
In conclusion, phosphoric and citric acids are key ingredients in Diet Pepsi, contributing to its distinctive flavour and providing preservative effects. While these acids are generally safe, consuming Diet Pepsi in moderation is recommended to maintain a healthy diet and avoid any potential negative health effects.
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Caffeine content: caffeine-free version available
Caffeine is a stimulant that occurs naturally in foods like tea, coffee, and chocolate. It's also added to some drinks, such as cola, and is present in Diet Pepsi. Caffeine is known to increase mental alertness and provide a boost of energy, which is why it's a popular ingredient in drinks consumed throughout the day, especially in the morning or during a mid-afternoon slump.
However, not everyone wants or can tolerate caffeine in their diet. Some people may be sensitive to caffeine's effects, experiencing jitters, anxiety, or difficulty sleeping if they consume too much. Others may wish to avoid caffeine for health reasons or simply prefer not to include it in their daily routine. Recognizing this, PepsiCo offers a caffeine-free version of Diet Pepsi, providing the same refreshing taste without the stimulating effects of caffeine.
The caffeine-free option contains the same blend of ingredients, including sweeteners and flavourings, but without the addition of caffeine. This means that those who wish to avoid caffeine for any reason can still enjoy the distinctive taste of Diet Pepsi. The absence of caffeine makes it a suitable choice for those looking for a refreshing, great-tasting drink at any time of the day or night without the worry of disrupted sleep or increased heart rate.
The caffeine-free version of Diet Pepsi is a welcome option for those who are mindful of their caffeine intake or prefer to avoid it altogether. It provides the same satisfying experience as the original Diet Pepsi but without the stimulating effects of caffeine. This option ensures that consumers have a choice, catering to individual preferences and allowing everyone to enjoy the unique, refreshing taste of Diet Pepsi according to their needs and lifestyle choices.
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Frequently asked questions
The new Diet Pepsi formula, released in 2018, contains carbonated water, caramel colour, phosphoric acid, aspartame, sodium benzoate, acesulfame potassium, flavour (natural), and citric acid.
Yes, Diet Pepsi is a zero-sugar, zero-calorie drink.
Diet Pepsi and Diet Coke are both zero-sugar, zero-calorie cola drinks. However, Diet Pepsi is said to have a lighter, crisper, and more refreshing taste.
Diet Pepsi is a sugar-free and calorie-free version of Pepsi.
Diet Pepsi was first test-marketed in the United States under the name Patio in 1963. It was then launched nationally as Diet Pepsi in 1964, becoming the first diet cola to be distributed on a national scale in the US.










































