Which medical breakthrough is most likely to appeal to an overweight person?

A way to safely increase GLP-1 in humans

GLP-1 refers to "Glucagon-like peptide-1." It is a 30 amino acid long peptide hormone responsible for several functions in the body including the promotion of insulin production in a glucose-dependent manner. GLP-1 is also known to decrease a person's appetite by inhibiting gastric emptying, acid secretion and motility in the stomach. Other possible functions of GLP-1 include protective and regulatory effects in different tissues in the body including the heart, lungs, muscles, bones, kidneys, and several others.