If the pecans have become rancid or moldy, yes - eating them could make you ill.
last night i ate some, and i was fine. still am(;
Eating too much of anything that's too old will make you sick. If your a very healthy as it is chances are you won't get sick
Only if it is spoiled. You will know if it is spoiled if it has a bad taste or color to it. It can give you an upset stomach, vomiting, cramps and diarrhea. it will also have kinda a white looking...
A general rule on old fruits and vegetables is that if they taste good they are safe to eat.
yes old cheetos can spoil and become unhealthy to eat (and I'm not so sure about the fresh ones either) :)