A low-carb, high-fat diet is remarkably effective at transforming people's bodies, helping them shed pounds and find relief from common health conditions. No one knows this better than Suzanne Ryan. After struggling with her weight for most of her life, she stumbled onto the keto diet and decided to give it a shot. In just a year, she lost more than 100 pounds and in the process reclaimed control over her health.

For the past two years, Ryan has shared every detail of her story, from the very first days of starting keto to her most recent successes, on her popular blog, Keto Karma,...