One of the most popular beverages in America is becoming extinct

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The Dangers of Too Much Diet Soda

As Americans drink less soda, one bubbly beverage is falling much faster than the rest: diet soda.

Since 2005, American consumption of diet soda has fallen by more than 27% - a loss of 834 million cases. In 15 years, the category went from accounting for nearly 30% of all carbonated beverages by volume sold in the US to roughly 25%, according to Beverage Digest data.

And the fall of diet isn't slowing down. Diet brands like Diet Coke and Diet Pepsi have accounted for 94% of all carbonated soft-drink declines since 2010.

"It's a staggering figure," Jonas Feliciano, a market consultant for Beverage Digest, said at the trade publication's Future Smarts conference in New York in June.

Related: Coca-Cola through the years:

18 PHOTOS
Coca-Cola through the years, Coke soda
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Coca-Cola through the years, Coke soda
The Atlanta based Coca-Cola Co., announced in New York Tuesday April 23, 1985 file photo a change in the 99 year old secret formula for the soft drink. This collection details the history of shapes of the soft drink's bottles. Sold at fountains in Atlanta at the start it was first bottled in Vicksburg, Mississippi. (AP Photo)
UNITED STATES - CIRCA 1950s: Teenaged girl with bottle of Coca-Cola. (Photo by George Marks/Retrofile/Getty Images)
(GERMANY OUT) *23.03.1912-16.06.1977+Physiker, Raketenforscher, D/USA- Porträt mit Coca-Cola-Flasche- 1963 (Photo by ullstein bild/ullstein bild via Getty Images)
The bottles of Coca-Cola are shown May 5, 1986. (AP Photo/Joe Holloway, Jr.)
FRANCE - MAY 01: Centenary of Coca-Cola In France In May, 1986. (Photo by Didier CONTANT/Gamma-Rapho via Getty Images)
The bottle used by Coca-Cola for export to France, stands by the prototype of the very first Coke bottle shown May 5, 1986 in Atlanta, Ga. (AP Photo/Joe Holloway, Jr.)
BOHOL, PHILIPPINES - 1988/01/01: A lemur clings to a coke bottle. . (Photo by Roland Neveu/LightRocket via Getty Images)
Bottles of Coca-Cola, Tab, and Sprite on the shelf of a grocery store in New York City, USA, September 1988. (Photo by Barbara Alper/Getty Images)
SAN FRANCISCO - JANUARY 16: Bottles of Coca-Cola are seen on the shelf at Tower Market January 16, 2004 in San Francisco, California. Coca-Cola is being investigated by U.S. regulators over allegations raised by a former employee that it had inflated its earnings. (Photo by Justin Sullivan/Getty Images)
SAN FRANCISCO - JANUARY 16: Cans of Coca-Cola are seen on the shelf at Tower Market January 16, 2004 in San Francisco, California. Coca-Cola is being investigated by U.S. regulators over allegations raised by a former employee that it had inflated its earnings. (Photo by Justin Sullivan/Getty Images)
UNITED STATES - OCTOBER 20: Bottles of Coca-Cola and Diet Coke are displayed on a shelf in an Associated Supermarket in New York Thursday, October 20, 2005. Coca-Cola Co. said third-quarter profit surged 37 percent, the biggest gain in more than a year, as sales rebounded in the U.S. and demand for Powerade sports (Photo by Ramin Talaie/Bloomberg via Getty Images)
PARK RIDGE, IL - NOVEMBER 07: 2-Liter bottles of Vanilla Coke as seen in a grocery store November 7, 2005 in Park Ridge, Illinois. Atlanta-based Coca-Cola Co. has said it plans to discontinue its Vanilla Coke in the US by the end of the year. (Photo by Tim Boyle/Getty Images)
NEW YORK - FEBRUARY 19: A general view of the new aluminum Coca-Cola bottle at Mercedes Benz Fashion Week Fall 2009 Collections at Bryant Park on February 19, 2009 in New York City (Photo by Donald Bowers/Getty Images for The Coca Cola Company)
Bottles of Coca-Cola Co.'s Coke brand soda sit on a shelf behind the bar at Smith & Wollensky in New York, U.S., on Monday, Feb. 22, 2010. Coca-Cola Co., the world's biggest soda maker, agreed to buy the North American operations of bottler Coca-Cola Enterprises Inc., more than six months after PepsiCo Inc. moved to bring its bottlers in-house to cut costs. Photographer: Daniel Acker/Bloomberg via Getty Images
A Coca-Cola bottle is displayed during a preview of the High Museum's new exhibit, "The Coca-Cola Bottle: An American Icon at 100", Wednesday, Feb. 25, 2015, in Atlanta. The exhibit, opening Feb. 28, explores the iconic design and creative legacy of the familiar soda bottle as art. (AP Photo/Branden Camp)
A piece by artist Andy Warhol, left, is displayed next to a case of Coca-Cola bottles at the High Museum's new exhibit, "The Coca-Cola Bottle: An American Icon at 100", Wednesday, Feb. 25, 2015, in Atlanta. The exhibit, opening Feb. 28, explores the iconic design and creative legacy of the familiar soda bottle as art. (AP Photo/Branden Camp)
LONDON, ENGLAND - MARCH 19: Rita Ora attends photocall to celebrates 100 years of the Coca-Cola Contour Bottle at the Coca-Cola Contour Centenary Bar on March 19, 2015 in London, England. (Photo by Mike Marsland/WireImage)
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The US is turning against sugar-packed sodas, with nutrition advocate rallying against Pepsi and Coke sales of calorie-packed beverages. Diet sodas at first seem like the perfect replacement - a lower-calorie option that people can drink without worrying about their health. But sales are dropping even faster than full-calorie beverages.

If soda giants want their diet business to survive in 2016, then they need to answer one question: Why do customers hate zero-calorie sodas?

Diet soda hit its peak in 2005, when more than 3 billion cases were sold in a year. But as diet sodas peaked, concerns regarding aspartame and other artificial sweeteners were gaining momentum.

While the FDA and most nutritionists agree that aspartame is safe to consume, soda giants began to look for other solutions as sales declined. While Coca-Cola remains committed to aspartame, last August PepsiCo announced that it was cutting aspartame from Diet Pepsi, citing not health concerns, but customer demand.

"Diet cola drinkers in the US told us they wanted aspartame-free Diet Pepsi and we're delivering," Seth Kaufman, senior vice president of Pepsi and Flavors Portfolio, said in a statement. "We recognize consumer demand is evolving and we're confident cola-lovers will enjoy the crisp, light taste of this new product."

Consumers didn't respond as Pepsi had hoped.

The negative backlash was immediate, and instead of stopping falling sales, Diet Pepsi's performance declined only after the new recipe's debut.

"Diet Pepsi is awful," one customer wrote on the company's Facebook page soon after the aspartame-free version was released. "I hate the new flavor."

Ultimately, Americans drank less of Diet Coke and Diet Pepsi - the two brands that make up half of all diet-soda sales - in the last year. In 2015, Diet Pepsi consumption dropped by 5.8% by volume, while Diet Coke dropped by 5.6%, according to Beverage Digest data.

Clearly, including or cutting aspartame isn't the only problem in the diet-soda industry. Instead, the issue may be in the inherent nature of diet sodas.

"The focus has largely been on new product formulations that seek to mimic their full sugar counterparts. That, in essence, is where some of the problems lie," Feliciano said of the diet-soda industry. "There's no no-calorie sweetener that is currently on the market that can 100% mimic the taste of sugar or high fructose corn syrup."

Basically, when you want a Coke, you want a Coke, not something that tastes kind of like a Coke. Some customers have become die-hard Diet Coke or Diet Pepsi fans - and, when companies change formulations to fit health trends, they lose those customers.

But new customers seeking lower-calorie options aren't gravitating toward lower-calorie imitations, as the anti-artificial ingredients trend remains strong in the food and beverage business.

While this creates problems for diet-soda brands, it also provides a possible solution for the industry.

Instead of diet soda, consumers are turning to functional beverages: options like energy drinks, sports drinks, tea, and bottled water that serve a clear purpose for consumers.

In the same 15-year period that the diet sodas declined by 28%, single-serve bottled water sales grew 76% by volume. Sports drinks grew 20%, while bottled, ready-to-drink tea grew a whopping 91%.

"A big part of their success is there is no full-flavor original to compare them to," said Feliciano.

As it's become clear that diet sodas aren't the new, healthy option that consumers are looking for. Soda companies have been scrambling to invest in beverages that Americans are drinking - many of them non-carbonated.

Coke announced in April that sales of non-carbonated "still" beverages, including water and Minute Maid, had increased 7%. Its packaged-water volume increased in the double digits in the first quarter of 2016, as did other healthier ready-to-drink options, like sports drinks (7%) and tea (2%).

"Over the last 15 years, we've gone from still being a single-digit part of our portfolio to now over 25% of our portfolio," Coca-Cola COO James Quincey said of non-carbonated offerings in an earnings call in April. "We expect to continue to grow faster in stills ... and we'll continue to look for acquisitions to accelerate our growth."

Early in June, Coca-Cola announced it is buying the largest soy-beverage brand in Latin America for $575 million. In January, the company bought a 40% stake in Nigeria's largest juice maker, TGI Group's Chi Ltd., in January, with plans to buy the rest within the next three years.

PepsiCo CEO Indra Nooyi said in April that less than 25% of the company's global sales are from soda. Instead, the company is focusing on healthy snacks and non-carbonated beverages - a process the company calls "future-proofing."

But when it comes to "future-proofing" the soda business, it's clearly not simply about cutting sugar and calories. If it was, then the diet-soda industry would still be thriving. Instead, it comes down serving a beverage that serves a function for consumers - and doesn't try to imitate the sodas that Americans know so well.

For example, PepsiCo's Mountain Dew Kickstart has been one of the biggest success stories in the beverage industry in recent years. A 12-ounce can contains real juice, 60 calories, and 92 mg of caffeine. It's not a health drink, but it is one that fits a consumer's need for caffeine without the negative stigma associated with soda.

The energy-beverage brand, which launched in 2013, now generates more than $300 million in annual retail sales.

In 2016, when consumers think healthy, they don't think diet. Instead, they think of water and sports and energy drinks, even if these beverages are packed with calories and sugar. It's a major shift for the beverage industry, but it's one that provides an opening for new brands and acquisitions that fit a new definition of health.

SEE ALSO: Governments around the world are taxing soda, and it's forcing Coke and Pepsi to make major changes

RELATED: This is exactly what happens one hour after drinking Coke

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This is exactly what happens one hour after drinking a can of coke
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This is exactly what happens one hour after drinking a can of coke

In the first 10 minutes: 

10 teaspoons of sugar enter your system aka 100% of your recommended daily intake. Your body doesn't immediately reject the sweetness overload because phosphoric acid cuts the flavor allowing you to keep it down.

40 minutes:

Caffeine absorption is complete at this point. Your pupils dilate, your blood pressure rises, and as a response your liver distributes more sugar into your bloodstream. The adenosine receptors in your brain are now blocked preventing sleepiness and drowsiness.

45 minutes:

Your body increases your dopamine production exhilarating the pleasure center of your brain. Note: This is exactly what happens to your nervous system when your body is on heroin. 

60 minutes: 

The frenzy within you settles down and your sugar crash commences. You may start feeling grouchy and and lifeless. At this point, you've omitted the water from the soda from your body.

>60 Minutes: 

The caffeine's diuretic properties percolate and make you want to use the bathroom. After using the bathroom, you have ejected the bonded calcium, magnesium and zinc that were initially meant for your bones. Sodium, electrolytes and water leave your body as well.

60 minutes:

You a get a further boost in your metabolism because the fizzy drink's phosphoric acid binds with calcium, magnesium and zinc in your lower intestine. The super large doses of sugar and artificial sweeteners also increase the urinary excretion of calcium.

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