I'm a 48 year old male that has been lifting since I was 15....Still love it to this day even though I'm not near as strong as I was when I was Div 1aa football player....but I digress....
When I was 23, I decided to do the Atkins diet....whicn is VERY similar to the new -fangled Ketogenic Diets of today...I lost a bunch of fat.....thought it was great......thought I'd be on it for the rest of my life......Totally ignored the fact that my strength was going down thanks to you know, no carbs.....All was great until...
Trying to sustain the diet was very difficult....and I inevitably fell off the Low carb bandwagon and for the love of God, the fat came back with a vengeance! The rebound was absurd.
Since then, I've tried to jump back on the low carb bandwagon from time to time only to find that the weight does not come off near as easy as the 1st time around....AND I feel like absolute dog shit on low carb diets now, even though I didn't back then...
I've recently taken a more modest approach based on calories and protein.....Working very well. Losing fat at about 1-2 lbs per week and strength staying very good. I literally track overall calories and protein and that's it.
So in summary....be careful before you jump onto a Ketogenic Diet. Many here promote it as the end all be all but for MOST people, it is NOT SUSTAINABLE......The guys that are saying it is sustainable are either outliers OR have not been doing it very long. You will eventually incorporate carbs back into your diet and you will BLOW up.
Don't be suckered. Your metabolism, aesthetics and strength will suffer in the long run.
Good Luck.