Research on chili peppers, black pepper, ginger and other spices has linked their bioactive compounds to cardiovascular, metabolic, antioxidant and pain-related effects, while traditional Chinese medicine describes many of the same foods through a separate framework centered on warming, circulation and internal balance.
By yourNEWS Media Newsroom
Spicy foods have long occupied an important place in traditional medicine, and a growing body of Western nutrition research is examining whether some of the compounds responsible for their heat and aroma may also influence cardiovascular health, inflammation, metabolism and pain.
An article published by The Epoch Times highlighted areas where modern nutritional science and traditional Chinese medicine, or TCM, appear to reach similar practical conclusions about ingredients such as chili peppers, black pepper, ginger and cinnamon, even though the two traditions explain their effects in fundamentally different ways.
Western researchers generally focus on measurable chemical compounds and physiological mechanisms. Traditional Chinese medicine instead classifies foods according to concepts such as warming and cooling properties, qi, blood, yin and yang.
Among the major compounds studied in Western research are capsaicin in chili peppers, piperine in black pepper and gingerol in ginger.
Large observational studies have also associated regular chili consumption with lower mortality. A review involving more than 570,000 people found that those who regularly ate chili peppers had a 26% lower risk of death from cardiovascular causes, a 23% lower risk of death from cancer and a 25% lower risk of death from all causes compared with people who rarely or never ate them.
Those findings show an association rather than proving that chili peppers themselves caused the reduction in mortality. Diet, activity levels, smoking, socioeconomic factors and other lifestyle differences can influence outcomes in population studies.
The chemical composition of spices can also vary depending on how they are processed. Extraction methods, drying, grinding and storage can affect the concentration and stability of active compounds, one reason some nutrition experts recommend buying whole spices when practical and grinding them shortly before use.
Piperine, the alkaloid responsible for much of black pepper’s pungency, has drawn particular research interest because of its effects on drug and nutrient metabolism.
The Epoch Times article cited research suggesting piperine can interfere with liver and intestinal enzymes that normally break down certain compounds before they enter circulation. That property can increase the bioavailability of some substances, although it can also create medication-interaction concerns at concentrated doses.
Laboratory studies have additionally examined piperine for possible effects on cancer stem cells. Such findings remain primarily experimental and should not be interpreted as evidence that eating black pepper prevents or treats cancer in humans.
Ginger contains gingerols and related compounds that have demonstrated antioxidant, anti-inflammatory and antimicrobial effects in laboratory research. Studies have also explored ginger for muscle soreness and oxidative stress, a process involving an imbalance between free radicals and the body’s ability to neutralize them.
Cinnamon extracts have similarly demonstrated antioxidant and antimutagenic activity in experimental research.
Chili peppers have received especially intensive study because of capsaicin, the compound responsible for their characteristic burning sensation.
Capsaicin interacts with a sensory receptor known as TRPV1, which plays a role in detecting heat and painful stimuli. Repeated exposure can reduce signaling involving substance P, a neurotransmitter involved in transmitting pain signals.
That mechanism explains why concentrated capsaicin is widely used in topical creams and patches for certain forms of chronic pain. Controlled trials have documented benefits from topical capsaicin in conditions including osteoarthritis, neuropathic pain and postherpetic neuralgia.
The evidence for pain relief from eating capsaicin is different from the evidence involving direct topical application, and consuming spicy food should not be considered equivalent to applying a therapeutic capsaicin product.
Capsaicin can also temporarily stimulate thermogenesis, the process through which the body generates heat and expends energy.
Activation of TRPV1 receptors can trigger sympathetic nervous system activity and produce a modest increase in calorie expenditure. Researchers have therefore studied capsaicin as a possible aid to weight management, although the effect is relatively small and does not replace dietary changes or physical activity.
Other research has explored whether capsaicin may influence blood pressure, cholesterol and broader cardiovascular risk.
TRPV1 receptors are involved not only in pain but also in thermoregulation, inflammation and metabolism, making them a continuing target of research into how spicy foods may affect human health.
Authors writing on the nutritional role of spices have argued that the typical American diet contains relatively few spices compared with traditional diets in some other parts of the world and have noted associations between higher spice intake and lower rates of some chronic diseases.
Traditional Chinese medicine approaches many of the same ingredients through an entirely different conceptual system.
In TCM, foods are commonly described according to qualities such as warm, hot, cool or cold. Pungent ingredients are traditionally viewed as having the ability to move qi and blood, stimulate circulation and disperse what practitioners describe as cold or stagnation.
These concepts are part of traditional Chinese medical theory rather than biomedical categories recognized in Western physiology.
“Fresh ginger, scallion, and cinnamon twig can often be used to thwart cold and flu viruses before they have really taken hold in the body,” Sharon Sherman, a licensed acupuncturist and herbalist, told The Epoch Times.
TCM practitioners also assign different functions to flavors.
Maz Roginski, a doctor of Chinese medicine and acupuncture, said pungent or spicy foods are traditionally associated with promoting sweating. Bitter flavors are described as descending, bland foods as helping absorb excess fluid and sour flavors as generating saliva and other body fluids.
Sherman said combinations of herbs and spices are central to Chinese herbal practice rather than each ingredient being considered solely in isolation.
One traditional example comes from the “Shang Han Lun,” a classical Chinese medical text dating to the Eastern Han dynasty. Sherman described a ginger-and-licorice decoction in which ginger traditionally serves a warming role while the sweetness of licorice is used to balance that effect.
Modern studies of ginger and licorice examine their chemistry and biological activity separately from those traditional explanations.
TCM practitioner and herbalist Dr. Reuben Chen said moderation is central to the traditional use of warming spices.
According to Chen, excessive consumption may be associated within the TCM framework with signs described as excess heat, including thirst, dry mouth, irritability and a yellow coating on the tongue.
Traditional responses to those symptoms may include foods and drinks classified as cooling.
Chen said mung bean soup is traditionally used to clear heat from the blood, chrysanthemum tea is used for symptoms such as red eyes and irritability, and peppermint tea is used to help vent heat through the skin.
The Epoch Times article also cited traditional Chinese medicine physician Dr. Naiwen Hu of Shanghai Tong Te Tang in Taipei, who has recommended slowly sipping warm water among simple traditional approaches used for symptoms such as heartburn.
Those recommendations reflect TCM practice and should not be interpreted as substitutes for medical evaluation when symptoms are severe, persistent or unexplained.
One area where traditional descriptions of pungency and modern sensory science intersect is the physical sensation produced by spices.
The heat from chili peppers, black pepper, ginger and horseradish is not technically a taste in the same way as sweetness, saltiness, bitterness, sourness or umami.
Instead, their pungency directly activates somatosensory nerve fibers involved in detecting pain, temperature and chemical irritation.
That is why spicy foods can produce sensations of burning, warmth, sweating or tingling even though the mouth is not actually being burned at ordinary culinary concentrations.
Capsaicin’s effects on sensory nerves have also been studied for their ability to desensitize C-fibers involved in pain transmission, providing a biomedical explanation for its established use in topical pain-relief products.
Despite the possible benefits, researchers and clinicians caution that concentrated spice supplements can behave differently from the amounts normally used in food.
“For most people, cooking with spices is a safe and beneficial habit,” Sophia Deahl, a registered dietitian at The Nourished Method, told The Epoch Times.
Deahl said people taking blood-thinning medications should consult a healthcare professional before using high-dose supplements containing turmeric, ginger or garlic because concentrated amounts may affect bleeding risk.
Quality and contamination are another concern.
David Goldman, a visiting researcher with the Faculty of Medicine at the University of Helsinki and a fellow of the Academy of Nutrition and Dietetics, recommended purchasing whole spices and grinding them at home when possible.
Whole spices can retain flavor and active compounds longer than pre-ground versions and may reduce exposure to adulterants or fillers sometimes found in lower-quality spice products.
Goldman pointed to a 2024 study examining 356 turmeric samples collected from India, Pakistan, Sri Lanka and Nepal. Researchers detected lead in 14% of the samples.
One known source of contamination is lead chromate, an industrial yellow pigment that can be fraudulently added to turmeric to intensify its color.
Goldman said consumer preference for bright yellow turmeric can encourage such adulteration in poorly regulated markets. In the most contaminated markets examined, he said lead concentrations were high enough that regular consumption by a child could produce blood lead exposure far beyond levels considered concerning by U.S. public health authorities.
There is no known safe level of lead exposure for children.
Storage also affects spice quality. Dried herbs and spices generally keep best when protected from heat, moisture and direct light. Keeping them in tightly sealed containers in a cool, dark location can slow the loss of aroma and active compounds.
Taken together, the research suggests that culinary spices may contribute useful plant compounds to an overall healthy diet, but the strength of evidence varies considerably depending on the ingredient and claimed benefit.
Topical capsaicin has established clinical applications for certain forms of pain. Ginger, cinnamon, piperine and dietary capsaicin continue to be investigated for effects involving inflammation, metabolism, cardiovascular health and oxidative stress. Large observational studies have also associated frequent chili consumption with lower mortality.
Traditional Chinese medicine reaches some similar practical recommendations about using spices in moderation, but it explains them through concepts such as warming, cooling, qi and circulation rather than the biochemical mechanisms used in Western medicine.
The overlap does not make the two systems scientifically equivalent, but it does illustrate why ingredients that have been used in traditional cuisines for centuries remain active subjects of modern nutritional and medical research.
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