This is the 4548th most frequent Japanese word.
常食
Regular diet; staple food.
In this sentence, "常食" is used to refer to "staple food" or something regularly eaten as part of one's diet.
私は毎日常食として魚を食べています。
I eat fish as my everyday staple food.
Here, "常食" describes the common dietary staple of a specific region or culture.
その地域ではお米が常食とされています。
Rice is considered the staple food in that region.
In this context, "常食" refers to staple food for emergencies or regular consumption during specific situations.