The guidebook writer and television personality reflects on his cancer diagnosis, social media’s corrosive effect on tourism and the transformative power of travel.Unlock full access to New York Times podcasts and explore everything from politics to pop culture. Subscribe today at nytimes.com/podcasts or on Apple Podcasts and Spotify.

A new study has found that nearly three-quarters of American adults are now obese or overweight, and there’s growing concern — among politicians, scientists and consumers — about one potential culprit: ultraprocessed foods.

Guest: Alice Callahan, a nutrition and health reporter for The New York Times, discusses how these foods came to be such a big part of what we eat, and why that’s so hard to change. 

Background reading: 

• There’s not enough evidence to recommend avoiding ultraprocessed foods, a scientific advisory committee says. Some experts disagree.
• Name a common condition — heart disease, Type 2 diabetes, cancer, dementia, irritable bowel syndrome — and chances are good that a diet high in ultraprocessed foods has been linked to it. 

For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday.

Unlock full access to New York Times podcasts and explore everything from politics to pop culture. Subscribe today at nytimes.com/podcasts or on Apple Podcasts and Spotify.

An alarming new hack by China has penetrated the nerve center of the United States: its telephone network.

David E. Sanger, the White House and national security correspondent for The New York Times, discusses what the scope of the attack tells us about China’s growing power.

Guest: David E. Sanger, the White House and national security correspondent for The New York Times.

Background reading: 

• The chairman of the Senate Intelligence Committee said hackers listened to phone calls and read texts by exploiting aging equipment and seams in the networks that connect systems.
• Emerging details of Chinese hack have left U.S. officials increasingly concerned.

For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday.

Unlock full access to New York Times podcasts and explore everything from politics to pop culture. Subscribe today at nytimes.com/podcasts or on Apple Podcasts and Spotify.

On Sunday, after a fire that many feared would destroy it, and a swift renovation that defied all predictions, the Cathedral of Notre-Dame reopened to the public.

Michael Kimmelman, the chief architecture critic at The Times, tells the story of the miracle on the Seine.

Guest: Michael Kimmelman, the architecture critic of The New York Times and the founder and editor-at-large of Headway.

Background reading: 

• Critic’s Notebook: Notre-Dame’s astonishing rebirth from the ashes.
• The rebuilding took about 250 companies, 2,000 workers, about $900 million, a tight deadline and a lot of national pride.
• See photos from the reopening.

For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday.

Unlock full access to New York Times podcasts and explore everything from politics to pop culture. Subscribe today at nytimes.com/podcasts or on Apple Podcasts and Spotify.

Jeanna Smialek, who covers the U.S. economy for The Times, will be 33 in a few weeks; she is part of a cohort born in 1990 and 1991 that makes up the peak of America’s population.

At every life stage, that microgeneration has stretched a system that was often too small to accommodate it, leaving its members — so-called peak millennials — with outsize economic power but also a fight to get ahead.

Guest: Jeanna Smialek, a U.S. economy correspondent for The New York Times.

Background reading: 

• When millennials gripe that they get blamed for everything, the accusers might actually be onto something.
• Millennials have the children, but boomers have the houses.

For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday.

Unlock full access to New York Times podcasts and explore everything from politics to pop culture. Subscribe today at nytimes.com/podcasts or on Apple Podcasts and Spotify.