GLP-1 drugs like Ozempic and Wegovy are being taken by millions of Americans. These medications have been approved for treating diabetes, obesity, and a small number of other chronic conditions. But even as experts are still learning how the drugs work, many people have found that they help with other disorders — from addiction to brain fog to arthritis — where anecdotal evidence is promising but the formal research hasn’t caught up. Julia Belluz, a contributing writer for the New York Times Opinion section and coauthor of Food Intelligence, joins Apple News In Conversation guest host David Greene to explain why what’s unfolding right now may be the largest uncontrolled drug experiment in modern history.