What Happens When Two Tastes Meet? Fifteen Pairwise Taste Transformations

When classical Chinese medicine discusses the Five Tastes, readers easily focus on fixed correspondences such as “sour enters the Liver” or “bitter enters the Heart.” In “Tongtian,” the Mirror Classic of Bian Que does something different: instead of listing tastes one by one, it directly lists pairwise combinations.

The text says:

Taste transformations are sour-bitter, sour-sweet, sour-bland, sour-pungent, sour-salty, bitter-sweet, bitter-bland, bitter-pungent, bitter-salty, sweet-bland, sweet-pungent, sweet-salty, pungent-bland, pungent-salty, and salty-bland.

Choosing two distinct tastes from six yields exactly fifteen combinations.

Why study more than a single taste?

Because real food intake is almost never a single-taste input. Foods, formulas, and ordinary meals usually bring multiple taste qualities into the body at the same time. Knowing the label of each individual taste is still insufficient to describe what happens when they coexist.

The Mirror Classic therefore advances the question from “what taste is this?” to “how do two tastes transform when they meet?”

This directly connects with the earlier grammar of Zhuan, Sheng, Jian, Bing, Tong, and He: tastes do not act in isolation but interact within an already existing qi-transformational background.

Fifteen is not a mysterious number; it is a combinatorial result

With six distinct tastes, choosing any two without repetition gives fifteen combinations. The passage then says that “left and right divide the positions, establishing thirty qi; yin and yang are fifteen,” placing the fifteen pairs further into left-right and yin-yang positional divisions.

This shows that the Mirror Classic is not interested merely in the list. It intends to embed taste transformation in a larger system of position and direction.

Can this be used directly to pair foods?

Not so quickly.

The source lists taste combinations, but this passage does not provide modern nutritional effects for each of the fifteen pairs, nor does it provide dosage rules that can be used directly for meal design. A more defensible reading is to acknowledge that the text establishes a combinatorial layer: beyond single tastes, the joint action of two tastes must also be studied.

If experiments are designed in the future, these fifteen pairs can serve as a matrix of conditions to be tested, but modern physiological effects cannot simply be filled in beforehand.

From food tastes to emotion, the structure is exactly parallel

More interestingly, the next passage applies almost the same method to human emotions: joy, anger, grief, thought, fear, and fright are also paired two by two, and each pair receives a new “transformation.”

This reveals a general method valued by the Mirror Classic: complex systems cannot be understood only by studying single factors; interactions among factors must also be studied.

The next article examines the fifteen pairwise combinations of emotion.