Three episodes into its first-season run, “Anthony Bourdain Parts Unknown” has been renewed for a second season on CNN, to debut on Sept. 15.

Since the Sunday series debuted April 14, it has averaged 389,000 viewers between age 25 and 54 ( the currency of news programming ad sales) — up 440 percent compared to the same period one year ago (72,000 viewers). In the age bracket, the show has ranked No. 1 among cable news networks on Sunday in each of its first three weeks on the air. Among viewers of all ages, Bourdain’s show is up 122 percent (872,000 viewers vs. 392,000 viewers) at 9 p.m. compared to CNN’s programming in the slot a year ago.

“In addition to its runaway ratings success, it is also quite the conversation starter, as anyone who follows social media can attest,” CNN Worldwide president Jeff Zucker said in Wednesday’s announcement.

In its second season, the network said, “Parts Unknown” will explore the food and culture of Spain, New Mexico, Israel, Copenhagen, Sicily, Detroit, Tokyo and India.

The show’s second season will, like the first, also run on CNN International, with a reach of more than 271 million households.