The invention provides methods and compositions relating to molecular targets associated with treating or preventing hypoglycemia. Included in the invention are methods and compositions relating to inhibiting the expression or activity of a glucose modulating agent associated with hypoglycemia e.g., Fibroblast Growth Factor 19 (FGF19). Also included in the invention are methods and compositions for increasing the blood glucose level of a subject. Additional aspects of the invention relate to methods for determining whether a subject has or is at risk for developing hypoglycemia, for example, post-bariatric hypoglycemia.
