I also started cycling (2x 1 hour a day) but noticed that I needed to eat more in order not to become overly exhausted and to keep my concentration. After three months, I didn't lose any significant amount of weight.
if you weren't in particularly good shape before you started cycling, the lack of weight loss might have been caused by your muscles growing. Almost every study/article about weight loss fails to mention that starting excersize causes muscle growth. And muscles weight 2x times more then fat. So if you're only checking your weight it might stay the same, but it's just you exchanging fat to muscles.
Yes, muscles definitely increased. My upper legs became more muscled which I could simply measure by the fact that I didn't fit in my jeans anymore. But at the same time, belly fat remained roughly as pronounced as it was before exercise.
The whole "exchanging fat for muscle" thing is wildly exaggerated. It really doesn't happen to any significant extent. You'll put a little muscle on your legs from cycling but at most probably a pound or two. When people claim they stayed the same weight but gained muscle, it's mostly wishful thinking. It's hard to put on significant muscle even when exercising specifically for that goal and intentionally gaining weight. It just doesn't happen accidentally from cycling to work.
Do you drink much? Anecdotally my friends seem way thinner shape once they cut out beer, maybe even alcohol entirely.
Studies leave it out because it's such a minor effect. You won't put on a meaningful amount of muscle from cardio. It's just wishful thinking when people see their weight stay the same and assume it means they've gained a bunch of muscle. Meanwhile their pants don't seem to fit much different... Lots of stomach muscle, I guess.
Sounds like your blood sugar is singing. Cutting excess carbs can get you to start burning fat and alleviate them.
Yes I'm now on a low carb diet since a number of weeks. I'm losing some weight, and feel less dizzy. But still every now and then I feel a need of energy, and eating e.g. some nuts doesn't seem to help much. But perhaps I'm still adapting.