3.4.3 is the golden ratio because the energy of breakfast, lunch and dinner accounts for 30%, 40% and 30% of the total energy respectively. Li Huiming, a professor of nutrition at Xiangya Hospital of Southern University, and Rui Lili, a doctor of food nutrition at China Academy of Military Medical Sciences, summed up a healthy collocation ratio of 3:4:3, which is very suitable for the body and is called the golden ratio. The golden ratio is a special mathematical ratio, which is usually explained by line segments.