I'm not doing Keto, but am doing low-carb and closely monitoring my caloric intake. It's working for me and so far I've lost the 10 lbs. I put on over the holidays when I stopped watching what I eat. I'm back down to where I was before (50 lbs. down from my heaviest) when I started going low carb but plateaued. But I wasn't closely watching calories then, which I am now. So I hope to get from 230 down to 200 or so.
I've heard some people say that they still eat anything they want, but just limit their calories. That may work for them but it seems like every time I eat sugar, my weight either stalls or goes up. Plus more protein and fat calories and less sugar calories means I get less hungry as the day goes on.