Social media is fueling enthusiasm for new weight loss drugs. Are regulators watching?

Suzette Zuena is her own best advertisement for weight loss.

Zuena, the "founder/visionary" of LH Spa & Rejuvenation in Livingston and Madison, New Jersey, has dropped 30 pounds. Her husband has lost 42 pounds.

"We go out a lot," Zuena said of the pair's social routine. "People saw us basically shrinking." They would ask how the couple did it. Her response: Point people to her spa and a relatively new type of medication — GLP-1 agonists, a class of drug that's become a weight loss phenomenon.