The keto diet is so popular because countless people have lost weight on it, like @fat2fitdreaj. She lost over 100 pounds on the keto diet and told the Instagram account @keto.fit.usa, "This lifestyle change was the best decision I've ever made. I never want to be over 300lbs again! There's no stopping me."
Check out our gallery of 18 before-and-after photos that show how effective the keto diet can be to lose weight.