Jameela Jamil has quit BBC Radio 1's Official Chart show after a year in the post.
The presenter is being replaced by Radio 1Xtra star Clara Amfo, 28, at the end of January.
Jamil, 28, who became the first female solo presenter of the Radio 1 chart show in January, said that a cancer scare in October gave her the impetus to decide to travel.
She said: "I've wanted to travel and work abroad my whole life, and always put it off due to the wonderful opportunities I have been afforded here, but a recent cancer scare jolted me to just do it, now, while I still can.
"Radio 1 are my family and have been incredibly supportive, and I am absolutely staying at the station but in a role that is flexible enough that I can leave the country for longer periods of time, than if I have a set weekly slot.
"I've literally never had more fun at work in my life than I do with Radio 1, and I hate to leave the chart, but I'm also excited for my next adventure."
Her Surrey-born replacement, who was nominated for the Rising Star award at the 2012 Sony Radio Awards, becomes the second solo woman to present the show since it began in the 1960s as Pick of the Pops.
She said: "It's an absolute honour to be taking the reins on a show as iconic as The Official Chart. It is a dream come true and I can't wait to announce the UK's number one for the first time."
Radio 1 and 1Xtra controller Ben Cooper said: "Clara is a fantastic presenter with huge potential and I know that fans of the Official Chart will love her energy and passion for music. I'm proud that 1Xtra continues to develop young talent for the BBC and the wider industry."
Jamil replaced Reggie Yates who announced in November last year that he was leaving the station.
Amfo begins her new role on Sunday January 25. She will also continue to host the Weekend Breakfast Show on 1Xtra.
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