The Chen Period is from 7:00 a.m. to 9:00 a.m., when the stomach channels are on duty. The stomach channel is a long passage at the front of the human body through which vital energy circulates in TCM anatomy. Stomach ache, in TCM philosophy is considered a disorder at the stomach channel; Knee pain is also considered a problem from stomach channel; same as the instep pains. These pains come from the places where the regular channels of the stomach are locating.

Eating breakfast during this period helps to replenish the nutrients in our bodies. This is also the time that Yang with its highest energy between the heaven and the earth, thus, taking breakfast during this period will get a better digestion, even a large breakfast will not make a person gains weight, because the spleen and the stomach channels are at their most active processing, which makes metabolism more active too. There is a Chinese saying that refers to eating breakfast being like the "rains at spring is as precious as oil". Therefore, one should have a best and hearty breakfast like a king does.