After the Buddha attained awakening, a layperson offered him a meal for the first time. At that time, each of the four heavenly kings offered a stone bowl to the Buddha, which the Buddha ate from and stacked. Following this example, disciples of the Buddha also began using four bowls for their meals, shaping a tradition that is still kept in present times.
In our tradition, temple food is food with principles, such as being grateful to everyone involved in preparing the meal, never wasting even a single grain of rice. Accordingly, meals are carried out in silence and humility.
Thus, it is natural food, health food, and meditation food.