I. Introduction
II. Overview of COVID-19 Pandemic
III. Epidemiology: COVID-19, Diabetes and Obesity
IV. Infection and Pathophysiology
1. ACE2 Expression
2. Dysregulated Immune Response
3. Cytokine Storm
4. Pulmonary Dysfunction
5. Glycemic Control and Insulin Resistance
V. Glycemic Complications
1. Diabetic Ketoacidosis and Hyperosmolar Hyperglycemic State
2. Hyperglycemia and Insulin Resistance
3. Euglycemic Diabetic Ketoacidosis
VI. Can COVID-19 Cause Diabetes?
VII. Treatment of Uncomplicated Diabetes
1. Basic Care
2. Glycemic Control: Glucose Level
3. Pharmacotherapy
VIII. Glycemic Control in Comorbid Diabetes and COVID-19
1. Metformin
2. Sulfonylureas
3. Dipeptidyl peptidase-4 (DPP-4) inhibitors
4. GLP-1 receptor agonists
5. Thiazolidinediones
6. SGLT2 Inhibitors
7. Insulin
IX. Treatment of Diabetic Complications
1. Nutrition
2. Obesity
X. Summary