There are a lot of healthcare companies that are investing in GLP-1 weight loss drugs. Today, the leaders in that space are Eli Lilly and Novo Nordisk. But it could get much more crowded in the future. And it's little wonder why, given analysts project that the obesity drug market could be worth $200 billion by 2031. It's a mammoth growth opportunity that can jump-start a company's sales and profits. Before drugs are approved, investors can gain insights into just how promising a GLP-1 drug is from the resu ...