Ozempic users are consuming fewer calories, and as a result are buying smaller sizes to fit their newly svelte bodies or, in some cases, are choosing more revealing fashion styles. Some clothing brands have noted their customers are buying new clothing items that are multiple sizes down, which they suspect is likely due to the customers dropping weight after taking Ozempic or similar GLP-1 weight loss drugs. At the same time, Walmart has said shoppers are purchasing "fewer units" of food due to the popularity of the drugs, and Nestle has even launched a line of foods specifically for GLP-1 weight loss medication users.

There's hardly a category of consumption, from food and beverages to travel and leisure, that Americans' increasing adoption of the weight-loss drugs won't shake up, according to analysts studying the drugs' impact on consumer behavior. "It's already affecting demand in some categories and it will affect demand in others. With millions coming into this new drug space, we are wondering what is it not going to affect?" Leigh O'Donnell, vice president of shopping insights at Kantar, a market research company, told CBS MoneyWatch.

Customers are sizing down Bryan Davis, founder of Teddy Stratford, a New York City-based company that makes fitted dress and casual shirts for men, said that in recent months, enough of his long-time customers suddenly started ordering shirts that were two sizes smaller than their usual orders that it caused him to consider what was drivi.