Keto is one trick of many. For someone that has a hard time losing fat and is very insulin sensitive, going to a keto approach can be an answer. It all depends on the person. I keep a client eating as much as they can, in order to grow as much as possible, while losing fat. The more carbs I can leave in the diet, the longer they will be able to grow. If we have tried a straight diet and progress has stopped, then went to carb cycling and progress has stopped, then keto might be the answer