NEW YORK, May 10 (Reuters) - Health and wellness firms are adapting quickly to the rising popularity of weight-loss medications, crafting new services around these treatments in hopes of avoiding the same downturn that led WeightWatchers to declare bankruptcy this week. The surge in demand for these powerful drugs has reshaped the entire industry practically overnight. While established firms like WeightWatchers falter, newer telehealth startups are facing regulatory headwinds. U.S. authorities