
Diet Pepsi was launched in 1964, becoming the first mass-distributed diet soda in the United States. The drink was first test-marketed in 1963 under the name Patio Diet Cola, but it was rebranded as Diet Pepsi the following year. Over the years, Diet Pepsi has faced competition from rival brands such as Tab, Diet Rite, and Diet Coke, and the company has introduced various flavour variations and spinoffs to broaden its appeal.
| Characteristics | Values |
|---|---|
| Year of Launch | 1964 |
| Test Marketed Under Name | Patio/Patio Diet Cola |
| Year of Test Marketing | 1963 |
| Competition | Tab, Diet Rite, Diet Coke, Coke Zero |
| Tagline | You got the right one, baby! |
| Flavours | Wild Cherry, Vanilla, Lemon, Lime |
| Caffeine-Free Version | Yes |
| Global Market Share in 2010 | 5.3% |
| US Market Share in 2010 | 5.3% |
| US Ranking in 2010 | #7 |
| Rebranded in | 2008 and 2009 |
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What You'll Learn

Diet Pepsi was launched in 1964
The story of Diet Pepsi began a year earlier, in 1963, when PepsiCo test-marketed a new drink called Patio Diet Cola. This prototype Diet Pepsi was well-received by consumers, particularly the Baby Boomer generation, who were increasingly embracing healthier dietary habits and alternatives to sugary drinks. Recognizing this shift in consumer preferences, PepsiCo made a strategic move to rebrand Patio Diet Cola as Diet Pepsi and introduce it on a national scale in 1964.
The launch of Diet Pepsi in 1964 was a bold innovation in the soft drink industry. Seeking to tap into the emerging trend of healthy lifestyles, PepsiCo introduced the first widely distributed diet soda in the modern US market. This move disrupted the duopoly of the two dominant players in the low-calorie beverage space at the time: Tab Soda, produced by Coca-Cola, and Diet Rite, offered by RC Cola.
The entry of Diet Pepsi into the market intensified the competition and marked the beginning of what would become known as the "Cola Wars." This decades-long rivalry between Pepsi and Coke extended beyond their classic offerings and spilled into the diet soda arena. The battle for market share and consumer loyalty led to innovative product launches, marketing campaigns, and even celebrity endorsements, with musicians, athletes, and actors featuring prominently in Diet Pepsi promotions over the years.
The ingredients and sweetening agents used in Diet Pepsi have evolved since its launch in 1964. Initially, the drink derived its sugarless sweetness from saccharin, the go-to artificial sweetener for diet sodas at the time. However, concerns about saccharin's potential health risks emerged in the 1970s, leading Pepsi to switch to aspartame as the primary sweetening ingredient. This adaptability in response to consumer concerns and evolving preferences has been a hallmark of PepsiCo's strategy, helping Diet Pepsi maintain its relevance in a dynamic market.
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It was the first mass-distributed diet soda in the US
Diet Pepsi was launched in 1964 as the first mass-distributed diet soda in the US. It was initially called Patio Diet Cola and was test-marketed in 1963. The drink was rebranded as Diet Pepsi a year later and distributed across the country.
The launch of Diet Pepsi was a strategic move by PepsiCo to re-energize the Cola Wars in the age of healthy lifestyles. It was the first of its kind in the US, and its arrival changed the trajectory of diet beverages. The product was well-received, and its success was attributed to shifting dietary habits and preferences among Baby Boomers.
In its early formulation, Diet Pepsi was sweetened with saccharin, the popular choice for diet soda creators at the time. However, in the 1970s, concerns were raised about the potential health risks of saccharin. Animal studies linked the artificial sweetener to bladder cancer, causing a public panic. Despite being later deemed safe for human consumption, this episode damaged consumer confidence in early diet soda sweeteners. As a result, Pepsi changed the sweetening ingredient to aspartame.
Over the years, Diet Pepsi has faced competition from rival brands, including Tab by Coca-Cola, which launched in 1958, and Diet Rite by RC Cola. The competition intensified in 1982 with the introduction of Diet Coke, which quickly became the leading diet cola brand.
To stay competitive, PepsiCo expanded the Diet Pepsi brand franchise through flavour-infused spinoff beverages, including wild cherry, vanilla, lemon, and lime. They also introduced a caffeine-free version and low-calorie options such as Pepsi Max and Pepsi Zero Sugar. The company has also revamped the product's packaging and branding several times to keep it feeling fresh and up-to-date.
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Its original sweetener was saccharin
Diet Pepsi was launched in 1964 as the first mass-distributed diet soda in the United States. Its original sweetener was saccharin, an artificial sweetener that was commonly used in diet sodas at the time.
Saccharin is a non-nutritive sweetener that is significantly sweeter than sugar. It was discovered in 1879 by scientists at Johns Hopkins University and was first used as a sugar substitute in the early 20th century. When Diet Pepsi was formulated in the early 1960s, saccharin was the primary ingredient that gave it a sugary flavor without the calories.
However, in the 1970s, concerns were raised about the consumption of saccharin. Animal studies linked the consumption of saccharin to bladder cancer, causing a public panic. As a result, Pepsi changed the sweetening ingredient in Diet Pepsi from saccharin to aspartame. Aspartame is an artificial sweetener that is also much sweeter than sugar but contains fewer calories.
The controversy surrounding saccharin had a significant impact on the diet soda industry. It shook consumer confidence in early diet soda sweeteners and prompted companies to seek alternative sweeteners. Despite being deemed safe for human consumption, saccharin fell out of favor as a sweetener for diet sodas.
Over the years, the sweetener used in Diet Pepsi has continued to evolve. In 2013, Pepsi changed the formula to use sucralose, and in 2016, they revived the aspartame formulation as the "Diet Pepsi Classic Sweetener Blend". Additionally, the availability and brand identification of Diet Pepsi flavor variants vary by country, with some countries using different sweeteners.
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Its main competitor was Tab Cola
Diet Pepsi was launched in 1964 as the first mass-distributed diet soda in the United States. Its main competitor in the low-calorie beverage category was Tab Cola, produced by arch-rival The Coca-Cola Company. Tab had been launched in 1961, three years before Diet Pepsi, and quickly became the leading brand in the diet soda market.
Tab was marketed as the "calorie-free Coke", and for nearly two decades, from the mid-1960s onwards, it was Diet Pepsi's prime rival. However, this competition was disrupted in 1982 when Coca-Cola launched Diet Coke, which soon became the top-selling sugar-free drink in the US.
The rivalry between Coca-Cola and Pepsi is well-known, and the two companies have long targeted each other in their marketing campaigns, a competition known as the "Cola Wars". The Cola Wars began in the late 1970s and escalated in the 1980s, with both companies employing various tactics to win customer loyalty. Coca-Cola's campaigns appealed to nostalgia and family memories, featuring iconic characters like the Coca-Cola polar bear and Santa Claus. Pepsi, on the other hand, used musicians, athletes, and celebrities in its promotions and introduced various slogans for its drinks, including "You got the right one, baby!" and "Pepsi's Got Your Taste For Life".
Over the years, the Cola Wars have continued, with both companies introducing new products and variations to meet diversifying consumer preferences and the growing demand for healthier alternatives. While Coca-Cola has maintained its position as the market leader, Pepsi has a broad lineup of snack brands and some analysts believe it has a chance to surpass Coca-Cola in the future.
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It has since undergone several sweetener changes
Diet Pepsi was launched in 1964 as the first mass-distributed diet soda in the United States. The original formula was sweetened with saccharin, an artificial sweetener commonly used in diet sodas at the time. However, in the 1970s, concerns were raised about the potential health risks of saccharin consumption. Animal studies linked the sweetener to bladder cancer, causing a public outcry.
As a result, PepsiCo made the decision to change the sweetener in Diet Pepsi. Starting in 1983, aspartame was used as the new sweetener. This change addressed the concerns around saccharin and positioned Diet Pepsi as a safer alternative. Aspartame, marketed as NutraSweet, became the main sweetener in the regular version of Diet Pepsi.
However, aspartame also faced controversy over the years. In 1996, a media report by 60 Minutes alleged a connection between the consumption of aspartame and the development of brain tumors in humans. This sparked concerns among consumers and led to a decline in trust for the brand.
In 2012, PepsiCo once again found itself in a position to change the sweetener in Diet Pepsi. This time, the company added a small amount of acesulfame potassium to the formula, creating a mix of two artificial sweeteners commonly found in newer diet sodas. This switch was made to prevent taste degradation over time and to ensure consistency in every sip.
In 2016, Pepsi revived its aspartame formulation as "Diet Pepsi Classic Sweetener Blend" in response to consumer feedback about the new formula. The company also announced plans to revert Diet Pepsi's sweetener from sucralose to aspartame, releasing the new formulation market-wide on February 25, 2018.
The changes in sweeteners over the years reflect PepsiCo's efforts to adapt to consumer preferences, address health concerns, and stay competitive in the dynamic soft drink market.
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Frequently asked questions
Diet Pepsi was launched in 1964.
Diet Pepsi was first test-marketed in 1963 under the name Patio Diet Cola.
The original drink used saccharin as a sweetener. After concerns were raised about the consumption of saccharin in the 1970s, Pepsi changed the sweetening ingredient to aspartame.
In its early years, Diet Pepsi competed with The Coca-Cola Company's Tab and RC Cola's Diet Rite.











































