New year, new you?

Amazon.com Inc.'s (AMZN) - Get Report Whole Foods should be glad you're trying to eat healthy in the new year. All those resolutions mean natural and organic foods are selling at an impressive rate.

After a brief downturn in dollar and unit growth, natural and organic sales are back on track with solid gains, according to a report from Nielsen on Tuesday, Jan. 9.

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At the beginning of December 2017, dollar growth in the natural and organic category had slowed to 8.1% from 9.9% on a four-week basis. But by Dec. 30, 2017, year-over-year dollar growth was back up to 10.2%, Nielsen found.

Leading the growth in natural and organic groceries was the deli category, with 17.1% growth, and the produce category, with 16.2% growth. The only category that shrank in 2017 was seafood.

Four-week total grocery sales worsened slightly on a one-year basis, but the two-year trend showed "nice improvement," Nielsen wrote.

The good news isn't just for Whole Foods, though. Total promotions decreased both month over month and year over year, which Nielsen said indicates an easing pricing environment.

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