Jillian Michaels is the main Keto Pooper, then you realize most of the people on her insipid show have gained all the weight back, and then some.
https://www.vox.com/the-highlight/2019/7/25/18744359/keto-diet-weight-loss-diabetes
This article is a non-scientific overview both pros & cons.
Here is a pull quote:
“...the work is nothing short of revolutionary. A guy named Thomas Kuhn pointed out that scientific revolutions dont happen overnight, they happen over time, he says. Were using a non-pharmaceutical, very powerful tool to hopefully halt and turn back an epidemic that is threatening our ability to provide health care because its such a dramatically expensive disease.