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The concept of "Quality of Food" refers to ingesting and refining only substances that are beneficial to oneself.
That is to say, when consuming elixirs tainted with elixir-poison, one would only refine the medicinal effects and expel the toxin with their breath.
Besides elixirs, this also applies to various types of Spiritual Rice and Meat, and so on, which, though cultivated using nature's spiritual energy, contain some impurities and sediment to a greater or lesser extent.
Over time, as these impurities accumulate, they could erupt as one ages, affecting a cultivator's body and lifespan, among other things.
But with the enhancement of "Quality of Food," there's no need to worry about such issues anymore. Chen Mobai, even if he consumed highly toxic substances, would only absorb the beneficial components and expel the toxins.
To describe this talent in another word, it would be "Immune to All Poisons!"
