Leptin & Ghrelin: The Science of Hunger and Satiety Explained | 2025 Research Leptin & Ghrelin: The Master Hormones Controlling Your Weight Published: April 5, 2026 | Reading Time: 12 minutes | Science & Health Understanding the delicate balance between leptin and ghrelin is key to mastering your metabolism Quick Summary: Leptin (the satiety hormone) and ghrelin (the hunger hormone) work in opposition to regulate your appetite, metabolism, and body weight. While leptin signals your brain that you're full, ghrelin tells you it's time to eat. Understanding these hormones can revolutionize your approach to weight management. What Are Leptin and Ghrelin? Your body's weight regulation system is far more sophisticated than s...