I just read a couple of good posts on the stages of overtraining:
http://breakingmuscle.com/training/overtraining-can-kill-you-3-stages-overtraining-part-1
http://breakingmuscle.com/training/overtraining-can-kill-you-3-stages-overtraining-part-2
I wish I'd understood more about it in my younger, dumber days. I definitely went down that road. Nagging injuries, lingering colds, constant fatigue, lack of enthusiasm, decreasing performance. I went years exercising 2-3 hours per day 6-7 days per week. I never fully recovered from my training sessions. I just kept breaking it down. I remember taking painkillers so I could run on the treadmill with an injured disk in my back. I trained with broken bones. When I had vertigo, I did cardio on a recumbent bike with a trash can next to it. That way if I had an epic room swoop, I didn't have far to fall to the floor, and if I had to throw up, the trash can was right there. Staying home did not occur to me!! I remember having a biopsy with stitches and the doctor telling me not to train for 10 days. I was at the gym the next morning, throwing punches with the stitched up shoulder. When I was in a hip to ankle leg brace and on crutches, I still went to martial arts.
I did the sugar burning thing he talks about in part 2 where I was sucking down more and more carbs for "energy" but I wasn't feeling energized. I was gaining weight in spite of the hard training and I would fall asleep sitting up. To counter that, my stimulant intake went through the roof. At the height of my diet soda madness I was drinking 2 liters + 4 cans of Diet Mountain Dew per day, every day.
Now I'm training a teeny fraction of what I used to and I'm in much better shape. Nothing hurts. I rarely get sick. I have plenty of energy. Food is easy. I still love caffeine but I use it appropriately--2 glasses of iced tea in the afternoon. I enjoy my workouts. The dread and struggle is gone.
Tell me about overtraining. Have you experienced it? What drove it? Have you experienced the flip side of getting better results with less training? How did overtraining affect your food intake and weight? If you stopped, how/why did you stop? Have you experienced lingering health consequences?
This is a thread from my Happy Eaters site. You can see more of the conversation .


I bought 
I just finished a good book,