The movement of upward and downward energy in the body is reflected in the structure of the large intestine, and in the function of the brain. The large intestine moves upward on the right side of the body, and downward on the left. The right hemisphere of the brain generates more yin, aesthetic or artistic images, while the left is the source of more yang, analytical and rational abilities. Using these basic classifications, we can begin to make specific correlations between the energy of food and the energy of the body. Day to day, the atmosphere cycles back and forth between upward and downward, or yin and yang energy.
Morning is the time when upward energy prevails.
Evening and night are the times when downward energy is strongest. In order to maintain optimal health and well-being, we need to orient our lives in harmony with the movement of energy. In other words, we need to wake up in the morning and be active during the day, and need to get adequate sleep at night. If we go against the movement of atmospheric energy, for example, by sleeping during the day and being active at night, we risk losing our health. On the most fundamental level, health and healing operate on the same principle.