No matter how much I eat and drink (even avoiding rotten stuff), eventually I "get tired", "begin to faint", head hurts, etc. etc. and eventually pass out.
How on earth are you meant to fight your character having the weakest constitution of all time? I'm a dayz veteran who can't keep a character alive more than an hour or two before he passes out (which might as well be a death sentence anyway)
Create a character, walk/run around and look for loot. Eat/drink. Try to sit with F3. Nothing helps. I get tired and pass out. The game is unplayable.
I have experienced the same thing. Two characters have ended up passing out even after prolonged periods of sitting with food and drink. No red error messages, just vision getting blurry and eventually I pass out. It almost feels like the character is on a timer. I read a report that if you drink from a well you cant drink from anything else, so might be related to that issue.
Happened to my first character, but now I just use the sprint sparingly when I really need it to get away quickly, and jog anywhere else. Haven't fallen unconscious again, although I get a lot of "I'm tired" messages and the like.
I do agree that the system at the moment is quite bad, especially because of the passing-out death sentence.