I would think good blood sugar control is a must before starting on something like that. It doesn't sound like you have that?

Lots has been written about how Muslim athletes fuel for training and competition during Ramadan. If I were thinking about doing something like that, I'd look at their and their trainers' discussions.

More generally, it annoys me when evolutionary justifications are advanced, without evidence, for various practices that might or might not be valid. True, the earliest hominids evolved in equatorial regions where night and day were close to equal, year round. But it's also true that human DNA changed quite a bit while we were developing agriculture (emphasizing carbs and relatively empty calories that enabled them to work more hours of the day) and dispersing throughout the world (possibly making localized adaptations to seasonal changes - such as what we've been talking about in the hunger/cold thread). I would think that anyone whose ancestry comes mostly from temperate climates would do better to tailor both activity and nutrition to the available natural light. Not that anyone with a job outside of agriculture can do that in the 21st century - and even a lot of agricultural work is no longer dependent on light any more, with GPS-guided farm equipment.