I was a 2 cans of soda a day drinker, and any given day if I felt like I didn't have enough energy one or both of them would be replaced with an energy drink (usually red bull). There was also a ~6 month period in my life that really did a number on me, where I was working a day job and continuing that aforementioned standard, but then I went to work at night on a project a friend of mine was starting up. In that night shift, I'd drink probably 2-3 large cans of this terrible stuff called "Unbound" to keep me awake. I don't know if they even make it anymore. I'd sleep for about 3 hours a night, and get up and repeat it.

Just before I turned 30, I found that I couldn't keep my eyes open, I'd fall asleep sporadically. In retrospect, I believe it was some pretty intense adrenal/caffeine tolerance combined with other health issues that were starting to develop. One day shortly after I turned 30, I woke up and my vision was so blurry that I couldn't see street signs from across the street. I went to a doctor, and it turns out I had developed diabetes. I was 313 pounds by that point, inflated by my long nights spent focusing on work instead of my health and very poor eating/drinking habits. Before that sudden exhaustion just before I turned 30, I felt like I could go at that pace forever. But it was like my body pushed the brakes hard.

The slightly good news is that I've turned my life around a bit. I quit both soda and energy drinks, switched to black coffee, I'm down to about 225 pounds and my blood sugar levels are normal - but only because of quitting both energy drinks/soda and almost abstaining entirely from carbohydrates. It's something that I'll have to watch for the rest of my life now.

Anyways, yeah. Don't do what I did. You'll feel invincible until you suddenly wake up one day and don't feel invincible anymore.