> If you want to lose weight and you plan to also exercise, going low carb will hamstring you. The difference between running in the morning fasted and running after eating a single banana is the difference between feeling like you are being tortured and being able bounce around like a bunny.

A low carb diet may still contain enough carbs to inhibit the ketone generation mechanism. Was your ketogenesis active at the time? My experience of exercising under ketogenesis was OK.