Whole Foods shareholders voted Wednesday to bless a $13.7 billion union with Amazon that the organic grocery chain's CEO had called "love at first sight."

That approval is one step required to close the deal, which is a bold move into physical stores for Amazon and has the possibility of bringing big changes to the supermarket industry and how people order groceries online.

By buying Whole Foods, Amazon will get more than 460 stores and potentially very lucrative data about how shoppers behave offline.

The deal also needs the go-ahead from government regulators. A union that represents food-industry workers has asked the Federal Trade Commission to scrutinize the deal closely, saying that it could hurt competition and lead to job cuts. Regulators tend to block deals when two direct competitors are combining, and Amazon — despite its dominance in the online marketplace — doesn't currently have a big groceries business.

In the meantime, rivals are scrambling to catch up with the e-commerce giant. Walmart, which has the largest share of the U.S. grocery market, is expanding its grocery delivery service with ride-hailing service Uber and announced Wednesdaythat it will join forces with Google to let shoppers order goods by voice on Google devices.

The deal may also breathe new life into Whole Foods, which had been under intense shareholder pressure to improve results and retain customers who have more choices about where to get natural foods. As Whole Foods grew, more supermarkets offered similar organic and natural foods, but at cheaper prices.

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Amazon and Whole Foods have not given many details about what might change for customers, though Whole Foods CEO John Mackey gave some general clues at a town hall with employees after the deal was announced. He said he thought Amazon would help with efforts on cost-cutting and a loyalty program. He noted Amazon is known for its innovation and said that company could turn Whole Foods from "the class dunce" to "valedictorian."

Mackey had said the deal came about after a "whirlwind courtship" and that "it was truly love at first sight."

As part of the deal, Amazon will pay Whole Foods shareholders $42 for each share they own. That was an 18 percent premium from its stock price the day before the tie-up was announced on June 16. Shares of Whole Foods Market Inc. were trading at $41.70 on Wednesday.

Earlier this month, Amazon.com Inc. sold $16 billion of bonds in order to pay for Whole Foods. Seattle-based Amazon has said it expects the deal to close before the end of the year.