I mentioned to a friend in an email about that exact thing:

Tell me about it. I saw those and I thought How in the hell am I still upright and not, like, curled up sobbing in a hole someplace? I mean, honestly, I feel pretty good! A little weak and fatigued most of the time, but not as bad as I could be. Not nearly as bad as I've been in the past.

I think it speaks volumes in regards to the impact of quality food and sleep, and contentment with one's life in general.