Spleen qi, a term of traditional Chinese medicine, is one of the five internal organs. According to the theory of visceral outward manifestation and channels and collaterals, the functions of the spleen qi are: (1) The spleen can transport food and liquids; (2) it functions to manipulate blood; (3) it controls muscles andlimbs; (4) the spleen qi is linked to the mouth.

1. Essence comes from food and the five flavors. The five internal organs, where essence is stored, can be hurt by excessively taking any one of the five food flavors.
2. When you eat too much sour food, the  liver qi will be so strong that the spleen qi will be drained.
3. When you eat too much salty food  your large bones will be hurt. You will suffer from muscular atrophy and the heart qi will be suppressed.
4. When you eat too much sweet food, your heart qi will be restless, your complexion will be dark and your kidney qi will not be in balance.
5. When you eat too much bitter food, your spleen qi will not be nourished and you will suffer from indigestion and stomach distention.
6. When you eat too much hot food, your tendons and pulse are hurt and you become flabby. The spirits will be harmed as well.

So when you have a balanced diet, your bones will be erect, tendons and pulse will be soft, qi and blood will circulate properly, and the space between skin and muscles will be firmly guarded. In this way, your bone qi will be strong. If people strictly adhere to this method of preserving life, they will enjoy the life accorded to them by Heaven. Also learn more in the article Relationships Between Spleen and Body-Sensory Organs and Orifices.