From your link to the Kundalini Research Foundation:
"It was the doctrine of development, a sacred (secret) science, which teaches that 'when rightly plucked, the forbidden fruit is the food of Life; wrongly, it is the fruit of Death.'"
Now THERE's an interesting way to conceptualize it: The same tree? In season, nutritive; out-of-season, poisonous? It kind of echoes the saying, "meat in due season . . ."
Thanks, David. Food for thought indeed.