I did Keto for about 3 months. The first 3 weeks i felt kinda like i had a mild flu, but after that I was great. I confirmed that I was in Ketosis by testing with Keto-sticks from Amazon.
I don't have an active lifestyle, at that time I think all I did for excercise was walking for work. I would have continued it except I had family issues.
What I ate was veggies (non-starchy), some meet, eggs, coconut oil and cheeses.