Compliance with prescribed dietary supplements Weight and BMI EWL Comorbidity assessment (prevalence and duration of type 2 diabetes mellitus, sleep apnea, hypertension, dyslipidemia/hyperlipidemia, and other clinically relevant comorbidities as determined by the treating physician), including medications and relevant lab tests per standard of care at 3, 6, and 12 months (glucose, hemoglobin, HbA1C, hematocrit, ferritin, albumin, total protein, calcium, parathyroid hormone, vitamin A, Vitamin B1, Vitamin B12, Vitamin D2/3, Vitamin 3, Vitamin K, folic acid, insulin, lipid panel, triglycerides, total cholesterol, high-density lipoprotein (HDL), low-density lipoprotein (LDL), C-peptides, iron, copper, and zinc) Surgical site infection assessment at 1 month only health-related quality of life (HR-QOL) (SF-36), GERD-HRQL and GSRS questionnaire expressed as change from baseline at 3, 6 and 12 months only need for endoscopy adverse events (see below)