Had a lovely talk with a chap in a supermarket who said his doctor had told him to go keto. Is there any scientific research on the keto diet?

He said this was for his week's food, not yet finished, but he gets his steaks from a proper butcher.
So much processed meats! I don't think that is keto at all, more like a typical American diet.
EDIT: Getting into ketosis is easy, just don't eat for a few days. It is a natural thing that happens where the body switches over to burning stored fats. Just don't do it too long, because once the stored fats get too low the body has to turn to burning proteins which leads to death in a few weeks. So most of us should stop eating for more than six or seven months.