NEW YORK — Parisa Imanirad, a scientist and cancer researcher from San Francisco, is married and has a wide circle of friends. But once or twice a week, she goes to a restaurant by herself.

Imanirad said dining alone gives her time to think or read. She tries not to touch her phone and relishes the silence. “It’s like a spa, but a different type,” Imanirad said during a recent solo lunch at Spruce, an upscale restaurant in San Francisco.

Imanirad isn’t alone in her desire to be alone. In the United States, solo dining reservations have risen 29% over the last two details ⇒

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