Such forecasts have prompted a sell-off in a wide range of companies from makers of bariatric surgery devices to companies whose products address the health issues created by excess weight, from diabetes to sleep apnea. "The market is in a shoot-first, ask-questions-later mood when it comes to weight-loss drugs," said Nicholas Anderson, manager of the Thornburg International Growth Fund, which holds shares of Novo Nordisk. By contrast, the iShares U.S. Medical Devices exchange-traded fund has lost more than 22% in the last three months. Injectable weight-loss drugs, known as GLP-1 receptor agonists, are considered highly effective but are also expensive, costing more than $1,300 per month. "Overall, we'll see an increased interest in bariatric surgery, but that will get delayed in the short term."

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Persons: Doctor Thomas Horbach, Wegovy, Nicholas Anderson, Eli Lilly, Kenneth Stein, Margaret Kaczor Andrew, William Blair, Michael Farrell, Jeff Jonas, Johnson, Myriam Curet, Ann Hynes, Hynes, David Gaffen, Manas, Michael Erman, Caroline Humer, Sonali Paul Organizations: Novo Nordisk, Healthcare, Growth Fund, Medical Devices, Boston, Gabelli Funds, Johnson, Reuters, Mizuho Securities, Manas Mishra, Thomson Locations: Germany, Munich, Danish, U.S, Boston, GLP, New York, Bengaluru