u/a_buh

I've always wondered about this. Some people seem to be able to work, study, exercise, socialize, and still have energy left at the end of the day, while others feel drained after doing only a few things.

I'm not talking about medical conditions, just everyday differences between people. Is it mostly genetics, sleep, diet, personality, stress levels, or something else? Have any of you managed to increase your energy levels over time, and if so, what made the biggest difference?

I'm curious to hear both scientific explanations and personal experiences.