What causes diabetes—and how do type 1, type 2, and gestational diabetes differ? This quick Rehealthify explainer breaks down the roles of insulin, the immune system, genetics, and pregnancy hormones. In under a minute, learn why these three types of diabetes develop for different reasons: • Type 1 diabetes: The immune system mistakenly attacks insulin-producing cells in the pancreas. Researchers are still studying the exact triggers. • Type 2 diabetes: Insulin resistance and insufficient insulin affect blood sugar regulation. Genetics, physical inactivity, and excess body weight can contribute to risk. • Gestational diabetes: Hormonal changes during pregnancy increase insulin resistance. Blood sugar can rise when the pancreas cannot produce enough extra insulin. CHAPTERS 00:00 Three Types of Diabetes & What Causes Type 1 00:19 Type 2 Diabetes: Insulin Resistance & Risk Factors 00:31 Gestational Diabetes: Pregnancy Hormones & Insulin For more clear, evidence-based health information without the hype, subscribe to Rehealthify. Rehealthify is an independent health-information and education channel. Medical Disclaimer: This content is for educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional regarding your health, medications, and treatment decisions. Sources & References MedlinePlus — Diabetes [https://medlineplus.gov/diabetes.html](https://medlineplus.gov/diabetes.html) National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) — Symptoms & Causes of Diabetes [https://www.niddk.nih.gov/health-information/diabetes/overview/symptoms-causes](https://www.niddk.nih.gov/health-information/diabetes/overview/symptoms-causes) NIDDK — Symptoms & Causes of Gestational Diabetes [https://www.niddk.nih.gov/health-information/diabetes/overview/what-is-diabetes/gestational/symptoms-causes](https://www.niddk.nih.gov/health-information/diabetes/overview/what-is-diabetes/gestational/symptoms-causes) #type1diabetes #type2diabetes #gestationaldiabetes #rehealthify