Ask HN: Can you share your experience on a keto diet?

As I'm trying to transition to a low-carbs-high-fat diet, I'm struggling with common side effects such as fogginess and being unfocused. Regardless, last few days I've been hitting the gym and swimming without much of a problem, just a mild fatigue. Still, I'm just getting into it and learning as I go.

Any tips that anyone who has been or is on this kind of diet can share to ease the transition?