The company's addressable market could eventually be expanded even more.As if billions of dollars in sales of weight loss drugs weren't enough, Novo Nordisk (NVO 4.13%) and its peers developing those medicines have a new opportunity that just might pad their wallets further. There's now reason to believe that the nascent market for Alzheimer's disease therapies could be reachable with many of the same products.Let's explore how this new possibility is being revealed, and what it might mean for share prices. ...