The keto or ketogenic diet was established in the 1920s by Dr Russell Wilder at the Mayo Clinic. He suggested it to children with extreme epilepsy that weren't replying to drugs, as well as discovered the diet reduced the frequency as well as severity of their seizures. Although, a current research has shown not all youngsters benefit from the diet. https://www.mdanderson.org/publications/focused-on-health/what-you-need-to-know-about-the-ketogenic-diet.h20-1592202.html