Is healthy eating really taking a bite out of fast food?

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It's no secret that healthy eating is booming across the country. Organic food has gone from a niche business pioneered by Whole Foods Market to a mainstream staple featured among the nation's biggest grocers, bringing previously lesser-known foods like kale and quinoa to prominence.

Sales of organic foods in the U.S. reached $39.7 billion last year, up 11% from the year before, and they're expected to keep growing at that pace. They now make up nearly 5% of all food sold in the country.

The effect on supermarket stocks has been clear as organic grocers like Whole Foods, Sprouts Farmers Market, and The Fresh Market have suffered as larger chains hone in on their territory. But the consequences of the healthy/organic movement can also be seen in the fast-food industry.

The rise of fast casual

In many ways, fast-casual chains have grown in tandem with the popularity of healthy and organic food. Chipotle Mexican Grill (NYSE: CMG), which essentially started the fast-casual movement along with Panera Bread (NASDAQ: PNRA), may be the best example. Its recent food safety crisis notwithstanding, the burrito chain has always promised "Food with Integrity," which means meat from responsibly raised animals, local produce when available, and food without GMOs or artificial flavors and fillers.

The company brags that its kitchens have no microwaves, can-openers, and freezers, and while some critics argue that Chipotle's calorie counts belie its marketing, the customizable menu, with options such as brown rice and tofu, means the customer is in control of their calorie intake.

Chipotle's success has spawned a number of imitators across the food spectrum as several fast-casual chains have had IPOs over the last few years, including Zoe's Kitchen, Noodles & Company, and Potbelly. Smaller privately held salad-based fast-casual chains like Sweetgreen and Chop't have also found success, indicating a broad and growing market for healthy fast food.

See the best chains for 'clean' food:

Best fast-food and casual restaurants for 'clean' food
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Best fast-food and casual restaurants for 'clean' food
FILE - In this March 4, 2015, file photo, an order of McDonald's Chicken McNuggets is displayed for a photo in Olmsted Falls, Ohio. McDonaldâs had signaled changes were in store in late 2014, and the company said it was evaluating the cooking procedures and ingredients for its core menu items. McDonald's said it is testing Chicken McNuggets made without artificial additives and fresh beef instead of frozen beef for some burgers. (AP Photo/Mark Duncan, File)
This Thursday, July 28, 2016, photo shows a Dunkin' Donuts in Edmond, Okla. Already, the emergence of smaller rivals promising more wholesome alternatives has major restaurant chains scrambling to improve the image of their food. But some of the tweaks theyâre making underscore how far they have to go in changing perceptions. Dunkinâ Donuts, for instance, says it plans to put more of a special ingredient in its egg patty: eggs. (AP Photo/Sue Ogrocki)
This Tuesday, June 28, 2016, photo shows a McDonald's sign in Miami. Already, the emergence of smaller rivals promising more wholesome alternatives has major restaurant chains scrambling to improve the image of their food. But some of the tweaks theyâre making underscore how far they have to go in changing perceptions. Convincing people it serves wholesome food is particularly important for McDonaldâs, which has long courted families with its Happy Meals and Ronald McDonald mascot. (AP Photo/Alan Diaz)
FILE - This Tuesday, Jan. 28, 2014, file photo, shows the door at a Chipotle Mexican Grill in Robinson Township, Pa. On Tuesday, April 29, 2014, Chioptle Chief Financial Officer Jack Hartung noted that the chain doesnât currently charge a whole lot more for its steak filling, even though beef costs have climbed considerably. He says Chipotle will widen the price gap between steak and chicken. (AP Photo/Gene J. Puskar, File)
MIAMI, FL - APRIL 27: Chipotle restaurant workers fill orders for customers on the day that the company announced it will only use non-GMO ingredients in its food on April 27, 2015 in Miami, Florida. The company announced, that the Denver-based chain would not use the GMO's, which is an organism whose genome has been altered via genetic engineering in the food served at Chipotle Mexican Grills. (Photo by Joe Raedle/Getty Images)
The Panera Bread Co. logo is seen on a cup of iced tea and a bag arranged for a photograph outside of a restaurant in Torrance, California, U.S., on Monday, Oct. 21, 2013. Panera Bread Co. is scheduled to release earnings figures on Oct. 22. Photographer: Patrick T. Fallon/Bloomberg via Getty Images
Chicken nuggets, french fries, and a fried chicken sandwich are arranged for a photograph during an event ahead of the grand opening for a Chick-fil-A restaurant in New York, U.S., on Friday, Oct. 2, 2015. Chick-fil-A, the Southern chicken-sandwich chain that has drawn both controversy and copycats over the years, has finally arrived in New York. The company will open a 5,000-square-foot (465-square-meter), three-level restaurant in Manhattan's Garment District that will be the chain's largest location in the nation. Photographer: Michael Nagle/Bloomberg via Getty Images

Big fast food responds

The legacy fast-food chains have taken notice. After several quarters of negative comparable sales in the U.S., McDonald's (NYSE: MCD) results have improved lately, in part because the chain has made promises to remove human antibiotics from its chicken and start using cage-free eggs. Mickey D's is also eliminating artificial preservatives from its Chicken McNuggets along with several other items on its menu, and has taken high fructose corn syrup out of its buns.

For years, McDonald's has offered healthy options such as salads, but as consumers have become more concerned about ingredients and processing, the company is responding to demand. It's also testing its "Create Your Taste" menu, which allows customers to customize their burgers with high-end options like guacamole and sriracha mayo.

Other fast-food chains have followed suit. Wendy's announced a couple of months ago that it would also remove human antibiotics from its chicken supply, with the goal of completing the elimination by next year. Like McDonald's, it's also pledged to use only cage-free eggs.

Not all fast-food chains have been changing with the times, however, as a recent report from a consortium of consumer and food safety groups gave 16 chains Fs on antibiotic use in meat, including Burger King, KFC, Dunkin' Donuts, Sonic and Starbucks.

Still, it's clear that the trend is moving toward healthy eating, as the study noted that twice as many restaurants as the year before received passing grades. Shareholders at KFC-parent Yum! Brands (NYSE: YUM) even pushed the company to adopt stronger measures on using meat from animals treated with antibiotics, a sign that the issue is of growing concern to investors as well as consumers.

While classic fast-food meals like burgers and fries will remain popular with a certain segment of the country, fast-food and fast-casual chains that cater to growing demand for healthy and organic foods should continue to find the most success. Traditional foods chains like McDonald's are adapting for good reason.

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John Mackey, co-CEO of Whole Foods Market, is a member of The Motley Fool's board of directors. Jeremy Bowman owns shares of Chipotle Mexican Grill. The Motley Fool owns shares of and recommends Chipotle Mexican Grill, Panera Bread, Starbucks, Whole Foods Market, and Zoe's Kitchen. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.

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