Overnight lean keto g back the weight you keep on trying to lose. Sounds too good to be true, right? Well it isn't and we are happy to teach you all about it with the -Day Weight Loss Challenge. A ketogenic diet is a very low carbohydrate, moderate protein and high fat based nutrition plan. A ketogenic diet trains the individual’s metabolism to run off of fatty acids or ketone bodies. This is called fat adapted, when the body .