The changes will be introduced slowly, over a period of five years, to give the company time to overcome technical hurdles and to give consumers time to adjust to foods’ new taste, Mr. Dach said.

沃尔玛的计划执行期为五年，一切改变都将从缓进行，一来为沃尔玛争取时间解决技术难题，二来也让顾客逐渐适应食品的新味道，达奇先生说。

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Leslie Dach graduated from Harvard and is an experienced lobbyist, field organizer and media relations strategist.

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The retailer has labored in recent years to polish its image, hiring Leslie Dach, a former Democratic campaign adviser, to lead its efforts.

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Mr. Dach, who is leaving the company later this year, spearheaded dozens of promises to eliminate landfill waste, sell healthier food and boost the company's use of renewable energy.

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