Abandon poisonous food" and "Don't make gods into demons" are warnings that only you know whether what you are doing is good practice ("gods" or "good food"). Anything could be used to build yourself up and smooth things over and calm things down or to keep everything under control. Good food becomes poisonous food and gods become demons when you use them to keep yourself in that room with the doors and windows closed.
From Start Where You Are : A Guide to Compassionate Living by Pema Chodron, Copyright 1994, Shambhala Publications.
Published by arrangement with Shambhala Publications, Inc., Boston.
This site provides an on-line database of commentaries on the Tibetan Buddhist meditation practices of lojong (Mind Training) and tonglen.