This isn’t the healthiest diet that’s for sure but the results can be enticing. It is a < 20 carbs a day diet that puts your body in Ketosis. This is when your body burns your body fat to supply you with energy instead of Carbs.

Hello @user_ch1535cb1

Here is an article from Mayo Clinic about the Pros and Cons of the Keto diet,
https://connect.mayoclinic.org/blog/weight-management-1/newsfeed-post/pros-and-cons-of-a-keto-diet/