This is funny because I do eat lots of carbs, drink quite a bit of coffee, and never take cold showers. Yet somehow I have plenty of energy. What do you think is going on here?
The type of carbs matters. I wonder how much of the carb demonization here is really code for high-glycemic stuff like cereals and bread, in particular sugary American bread.
If the carbs you eat in the morning are slow carbs, then there's no reason you shouldn't have high energy all through the day.
The other possible explanation is that you are young, and your body is (for a while yet) very good at regulating blood sugar.
It changes from person to person, I used to be the same too for some time.
What I was saying is not like "you can't have energy if you eat carbs and take hot showers" but more like "if you lack energy, try not eating carbs and start taking cold showers to see if it helps".
What works for one person might not work great for another. Maybe the cause is something else completely. I tend to eat something sweet with my coffee like 70% chocolate, throughout the day - small pieces. I don't feel that it is unhealthy at all.
If the carbs you eat in the morning are slow carbs, then there's no reason you shouldn't have high energy all through the day.
The other possible explanation is that you are young, and your body is (for a while yet) very good at regulating blood sugar.