From the book The Hormone Reset Diet: Balance your Hormones and Lose up to 15 pounds in just 3 weeks! by Sara Gottfried. Copyright © 2015 by Sara Gottfried. Reprinted by permission of HarperOne, an imprint of HarperCollins Publishers.

Here’s a mind-bender: Being overweight often has nothing to do with calories or exercise. For a huge number of us, the problem is instead about misfiring hormones. Research is still catching up with this paradigm shift, which has yet to be comprehensively studied. But seeing how this revelation has helped my patients (and me) slim down and feel better gives me confidence that it’s true for most women who are trying to lose weight and can’t. (In as little as 30 days, you can be a whole lot slimmer, way more energetic, and so much healthier just by following the simple, groundbreaking plan in The Thyroid Cure!) You already know about some weight-affecting hormone issues, like thyroid and insulin imbalances. But other, more subtle ones could also be keeping you from the body you want. Biology class, anyone?