In the myth system of the East, immortals pay more attention to their own practice. If they practice enough, they can breathe out the aura between heaven and earth and absorb the energy of nature efficiently. Many kinds of fairy tales have such chapters. Once the immortals meditate, or retreat, they often last for a hundred years, without eating or drinking. It shows that this fairy can completely abandon the secular eating and drinking Lazarus, and it is just as well not to eat, drink or sleep. There are also such scenes. For example, when the Empress Dowager organized the Flat Peach Conference, immortals from all walks of life got together to eat dragon liver and phoenix marrow, the nectar of the Jade Emperor, the flat peach of the Empress Dowager and the elixir of the old gentleman. But this way of eating is more like a way of spiritual cultivation, a process of learning and progress of these immortals, rather than being used to maintain physical function like mortals.
In the western myth system, immortals depend on the beliefs of mortals to survive. Both the Zeus family in Greece and the Odin family in northern Europe, like big capitalists, absorb the beliefs and sacrifices of the world to gain strength. For example, in the American drama American Gods, this setting was followed. Because of the decrease of believers, the ability of the old gods has greatly decreased, and even affected their own survival. In ancient Greek mythology, there was the same scene, and the ability of immortals was directly related to the number and piety of believers.
Immortals don't eat human fireworks, so that they can stand out from the bondage of the secular, and those who are bound by the secular will willingly believe in it. If believers think that their immortal may be eating fat and burping for a long time during prayer and worship, or squatting in a stinking toilet, I am afraid they will think that this immortal will worship or not, and I am afraid that's it.