Karl Jacob

Karl Jacob lost 80 pounds after a health wake-up call revealed dangerously elevated insulin levels and a high risk for type 2 diabetes.

Determined to change course, he spent four years studying peer-reviewed research and experimenting with practical strategies that work in real life. He wrote Fix Your Insulin to share what he learned with anyone still trapped in the cycle of diets that don't last. He has maintained his weight loss for more than a decade.