I did keto for 7 weeks back last year. Ah, the side effects.
Awful breath? Check.
Weird metallic taste in saliva? Check.
Smelly urine? Check.
Overall lack of energy for intense workouts? Check.
Don't get me wrong, I felt physically fine on ketosis, but doing sprints or lifting heavy weights was a bitch. The biggest side effect of all is the lousy food choices. Great, so I get meat, some nuts, a little cheese and 2 cups of spinach a day...yea...that's great.
Why are you doing keto? Why not eat 50-70g of carbs a day? You should still see fat loss but you'll actually be able to enjoy your meals since vegetables are back on the table. You can't even eat a reasonable salad on keto. I eat 15g of carbs worth of lettuce in my lunch salad alone. Since I'm not going to eat a stick of butter for a snack, if you're hungry, you're pretty much relegated to meat, which puts you into too high levels of protein which has the same insulinogenic problem as carbs. I wouldn't do keto again...