The keto diet has been on everyone's radar for a while now. The low-carb, high-fat diet is said to be a game changer for many people who want to lose weight. Although it may seem like a trend diet, it certainly shouldn't be treated as one; many experts say that the keto diet requires close supervision. However, many people who have done keto the right way have experienced great weight-loss success from the diet. Here are 20 before-and-after photos that prove just how effective this diet can be.