The present disclosure relates to antibodies or antigen-binding fragments thereof that bind specifically to the glucagon-like peptide 1 receptor (GLP1R) protein, and methods of use thereof. In various embodiments, the antibodies or antigen-binding fragments thereof are fully human antibodies that bind to GLP1R. In some embodiments, the antibodies or antigen-binding fragments thereof are useful for attenuating GLP1R activity, thus providing a means of treating, preventing, or alleviating a disease, disorder or condition associated with GLP1R in humans. In some embodiments, the antibodies or antigen-binding fragments thereof elevate glucose levels when administered to a subject and thereby treat hypoglycemia, such as post-bariatric hypoglycemia (PBH), by attenuating insulin secretion from pancreatic beta cells and decreasing insulin expression.