Triangle Endocrinology. Dietetics, Endocrinology, Diabetes & Metabolism • 4 Providers. 3440 Fannin St, Beaumont TX, 77701. Make an Appointment. (409) 833-6900. Telehealth services available. Triangle Endocrinology is a medical group practice located in Beaumont, TX that specializes in Dietetics and Endocrinology, Diabetes & Metabolism..