The Four Natures and Five Flavors of Foods and Herbs
What the four natures (cold, cool, warm, hot) and five flavors mean in Chinese medicine, how they were assigned, and what lab, animal and small human studies have found.
Content last updated . This page has not been medically reviewed.
What the terms mean
In Chinese medicine, herbs and many foods are described by a nature and one or more flavors. These are traditional labels, not lab measurements. The four natures are cold, cool, warm and hot. [1] Some substances are described as neutral, meaning they lean neither way. [1] The five flavors are pungent, sour, sweet, bitter and salty. [1] A substance can have several flavors but only one nature. [1]A flavor began with taste but grew into a shorthand for what a substance is traditionally said to do. [1] So a "sweet" herb is not necessarily one that tastes sweet.
Where the idea comes from
The framework of four properties and five flavors was set out early, in the Shennong Classic of Materia Medica (see classical materia medica). [2] Later writers added meridian entry, direction of action (ascending, descending, floating, sinking) and toxicity to the same system. [2] Modern reference works still organize herbs this way: one 2024 review built its herb list from the 2020 Chinese Pharmacopoeia and sorted findings by nature, flavor and meridian. [3]For how these labels fit into the wider classification, see how Chinese herbs are classified and meridians and collaterals.
How a nature gets assigned
A review of the theory's history notes that herbal properties were worked out in several ways, including by inference from what an herb was said to do. [2] In the same spirit, substances traditionally used to ease "fever syndrome" are generally labeled cold or cool. [1] That means a nature is partly a summary of traditional use, not an independent thermometer reading. This matters when you ask whether research "confirms" the labels.What research has measured
Researchers have tried to find physical signs that match the labels. The results so far are preliminary.| Question | What was done | What was found | Evidence label |
|---|---|---|---|
| Do "cold" and "hot" herbs change what temperature mice prefer? | Mice given Coptis (a "cold" herb) and processed forms were tested on a cold/hot plate. [4] | Bile-processed Coptis strengthened the "cold" effect and ginger-processed Coptis reversed it, which the authors said matched theory. [4] | Preclinical |
| Do herbs change body temperature? | A laboratory study measured rectal and skin temperature. [5] | Prepared aconite root and dried ginger warmed; Coptis showed both warming and cooling effects. [5] | Preclinical |
| Do natures line up with gut bacteria? | A 2024 literature review. [3] | Warm- and cold-natured herbs each promoted some beneficial bacteria; the authors note such studies capture only specific aspects of the theory. [3] | Preclinical |
| Do flavors match chemistry? | A computer-modeling study of mint-family herbs. [6] | A flavor reflects a mix of chemical classes, not one compound. [6] | Preclinical |
| Do "hot" and "cold" foods act that way in people? | A crossover trial of 16 healthy Chinese adults eating durian ("heaty") and banana ("cooling"). [7] | Durian produced a higher, longer thermic effect, but it lowered blood pressure over 3 hours, not raised it as tradition predicts. [7] | Insufficient evidence |
| Is there broader proof for foods? | A 2021 review. [8] | Studies linking cold-hot nature to food are insufficient. [8] | Insufficient evidence |
In the durian study, traditional belief held that the fruit raises body temperature and blood pressure; the trial was only 16 people eating one portion, so it cannot settle the question either way. [7]
What a nature or flavor does not tell you
- It is not a safety rating. Some Chinese herbal products have been contaminated with toxic compounds, heavy metals, pesticides and microorganisms and may have serious side effects. [9] See herbs with known safety concerns and product quality and interactions.
- It is not a way to choose for yourself. In practice a practitioner links a nature to a pattern they have judged, which is itself a traditional method (see pattern differentiation). This site does not offer a quiz; see why online TCM quizzes are unreliable.
- It does not replace medical care. Ask a doctor or pharmacist before combining any herb with prescription medicines, and tell them if you are pregnant or breastfeeding (see TCM in pregnancy).
For food use specifically, see Chinese dietary therapy and warming and cooling foods.
Frequently asked questions
Does "cold" in Chinese medicine mean the herb is physically cold?
No. Cold, cool, warm and hot are traditional labels, partly assigned from what a substance is said to do. [2] Some lab studies have tested them using temperature preference in mice, with preliminary results. [4]
What are the five flavors?
Pungent, sour, sweet, bitter and salty. [1] A substance can carry more than one. [1]
Is a "warming" food or herb good for me in winter?
Proper evidence not found that choosing foods by temperature label improves health. I looked for human trials and found one small crossover trial of 16 people and a review calling the evidence insufficient. [7][8] See seasonal eating for the traditional view.
Does the nature of an herb tell me if it is safe?
No. A label such as warm or cold says nothing about contamination, interactions or toxicity. [9] Ask a clinician or pharmacist.
Can I use natures and flavors to pick herbs myself?
It is not advised. Practitioners use them together with a pattern they have judged, and the evidence for that process is limited. See pattern differentiation and Chinese herbal medicine.
References
- Wang H, et al. The characterization of traditional Chinese medicine natures and flavors using network pharmacology integrated strategy. J Tradit Complement Med. 2024. Read 2026-10-22.
- Jin R, et al. A complexity analysis of Chinese herbal property theory: the multiple formations of herbal property. Zhong Xi Yi Jie He Xue Bao. 2012. Read 2026-10-22.
- Yang YN, et al. From ancient wisdom to modern science: gut microbiota sheds light on property theory of traditional Chinese medicine. J Integr Med. 2024. Read 2026-10-22.
- Zhou C, et al. Investigation of the differences between the "Cold" and "Hot" nature of Coptis chinensis Franch and its processed materials based on animal's temperature tropism. Sci China C Life Sci. 2009. Read 2026-10-22.
- Yang JM, et al. The effects of natural Chinese medicine aconite root, dried ginger rhizome, and coptis on rectal and skin temperatures at acupuncture points. Evid Based Complement Alternat Med. 2017. Read 2026-10-22.
- Zhang C, et al. Pattern recognition-based analysis of the material basis of five flavors of Chinese herbal medicines in Lamiaceae. J Tradit Chin Med. 2025. Read 2026-10-22.
- Ling CY, et al. Comparative effects of durian and banana consumption on thermic effect of food and metabolic responses in healthy adults. J Am Nutr Assoc. 2025. Read 2026-10-22.
- Zhou Y, et al. New insights into molecular mechanisms of "Cold or Hot" nature of food: when East meets West. Food Res Int. 2021. Read 2026-10-22.
- National Center for Complementary and Integrative Health (NCCIH, US). Traditional Chinese Medicine: What You Need To Know. Read 2026-10-22.