I lost 70 pounds in 4 months by cutting my caloric intake to 500 calories per day. I'm glad that worked for you but the placebo effect is a hell of a drug itself. What worked for you may not work for others. A diabetic cannot do keto as they would risk suffering from diabetic ketoacidosis. Like any other "fad" diet, it works for some and not others, but what will work is putting less food into your body. You cannot bypass human biology.