For years, Amazon ( amzn ) has been the specter looming over retail, as once-dominant department stores and specialty chains fell on harder and harder times. But up until now, the e-commerce titan has managed to irrevocably alter the industry without making much of a dent in retails biggest moneymaker of allthe $800 billion grocery business.

That changed on June 16 when Amazon announced its intention to acquire Whole Foods , the upscale supermarket chain that played a pivotal role in taking organic and natural foods mainstream. Whole Foods ( wfm ) itself may have been under duress, pressured by an activist investor and softening sales, but the healthy-food movement and the meticulously curated store experience that it pioneered is alive and well. Amazon is placing its bet on the future of the food industry, says Errol Schweizer, a former Whole Foods executive who is now an industry adviser, and they see Whole Foods as the leadership.

Most Amazon watchers are focused on the some 450 stores the e-commerce behemoth scoops up in the deal. These brick-and-mortar locations instantly give it a national physical presence, as well as a network of mini distribution centers for fresh produceby far the most challenging part of the grocery delivery business because of spoilage and the fragility of fruits and vegetables. (Upon news of the bid, grocery stocks took a nosedive accordingly.)

But Amazon isnt just trying to change how we buy groceries. Remember the companys original disruption: bookselling. Jeff Bezos not only shifted how and where books were sold; he also changed how they were made, by forcing publishers, authors, and everybody else along the book supply chain to cut their costs. The same thing could very well happen in food, and the outcome for food manufacturers could be as dire it was for book publishers. I would be terrified if I were a consumer packaged-goods company right now, says Benzi Ronen, CEO and founder of food hub management software startup Farmigo. Indeed, packaged-goods producers businesses are already under stress, with manufactured-food volumes at large companies declining 4% this year, as consumers seek out less-processed fare. And on the long-shot chance that Walmart ( wmt ) , playing defense, swoops in with a bigger bid, the same pressures will still be in play.

The overlooked asset Amazon gets in the deal is Whole Foods 365 house brandone of the most coveted in the organic and natural space, private label and otherwise. This is not your mothers generic box of cornflakes, with its bad design and perceived quality issues. A Piper Jaffray survey last spring found that 365 is customers favorite organic-food brand, ahead of premium names like Kelloggs-owned Kashi and General Mills Annies. The 365 brand is virtually unavailable online, but that will change if Amazon is smart about it. The opportunity to use the 365 brand as a mainstay of their online offering is really profound, says Bernstein analyst Alexia Howard. It puts a huge amount of pressure on branded food sales.

Amazon has tried to develop its own private label in food for years. In 2016 it rolled out its Happy Belly coffee, Mama Bear baby food, and Wickedly Prime snacks. These brands are available only to Amazon Prime members, who pay $99 a year for free two-day shipping, among a litany of other benefits. In a sign of how powerful its private label can be, analytics company 1010data found that for a 12-month period ending last year, 94% of all batteries sold online went through Amazon sites, and Amazons own brand made up about a third of all online battery sales. Its Amazon Elements baby wipes, introduced in 2014, have managed to capture 16% of online market share, despite being available only to Prime members.

Amazon and Whole Foods might seem like they are on opposite ends of the retail spectruma relatively small, high-end grocer vs. the massive e-commerce Everything Storebut they overlap in the power of their brands. Thats a rarity for a purveyor of food. Under the old model of food retailing, the brand you trusted was the manufacturer, Ronen says. Today you go onto Amazon and filter everything by whats Prime. Similarly, Whole Foods acts as a curator for shoppers by banning ingredients like saccharin and bleached flour from the products it sells. Together, the two trusted brands should create an even more powerful one. That could fundamentally alter the way grocery aisles lookand even make the aisles themselves obsolete.

A version of this article appears in the Jul. 1, 2017 issue of Fortune with the headline "The Deal That Made an Industry Shudder."

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Why Amazon's Whole Foods Deal Is Terrifying Food Makers - Fortune