Maybe it’s morning and you’re on your first cup of coffee, warm, roasty, faintly chocolatey, and distinctly, and unapologetically bitter. And what comes next is something most of us don’t talk about but absolutely notice: a glorious, satisfying poo. The body receiving bitter and moving accordingly, down and out.
Or maybe it’s lunchtime and you’re reaching for something cool and green, kale, arugula, and a tangle of dark mixed greens dressed simply. You want to feel light today. The leafy, peppery bite lands on the tongue and somewhere deeper within the body things begin to flush and clear.
This is what Early Summer does. In Traditional Chinese Medicine we’ve just crossed into the Fire Season, the most Yang-heavy, heat-saturated stretch of the year, and the body knows it before the mind does. It starts asking for foods that cool, clear, and move rising heat down. Foods that are bitter.
That is a lot of fire. Bitters give it somewhere to go.
My most recent grocery haul full of Summer bitters like burdock root, cacao, bitter melon, fresh motherwort, and arugula
Bitterness has a direction and that direction is down. In TCM it moves downward, draining and clearing, pushing accumulated heat out of the body and anchoring what wants to rise. You know this feeling even if you’ve never had a name for it. The skin that breaks out in the heat. That heavy sluggish feeling after eating when it’s hot outside, the bloating that just won’t shift. The restless 2 a.m. wake-ups when the nights won’t cool down. That right there is heat building in the body with nowhere to go.
This is why summer and bitterness belong to each other in TCM. Not because bitter foods are refreshing the way a cold drink is refreshing, but because they do the slower deeper work of clearing heat that has settled into the blood, the digestion, and the quality of the mind. The cooling is systemic. You feel it the next day, not the next minute.
And this particular summer I want to make an especially strong case for getting more bitters into your body. We are in a Fire Horse year, the most Yang-heavy combination in the sixty year cycle of the Chinese calendar, sitting inside the most Yang-heavy season of the year. I’ve been watching the first rumblings of this already as Europe moves into a dangerous and sweltering heatwave that’s already starting to see casualites. That is a lot of fire. The body needs every cooling, clearing, downward moving tool available to it, and bitters are at the top of that list.
The Heart Belongs to Summer
"The heart as emperor lives well protected at the center of the nation. No injury must come to the heart, and as long as the heart's function is intact, there is always hope of healing."
— The Yellow Emperor's Classic of Internal Medicine
In TCM the heart belongs to summer. Called xīn (心) in Chinese medicine, the heart governs the flow of blood, or Xue (血), and is the organ most vulnerable to the heat of the fire element. In early summer when Yang energy is at its peak the heart can become inflamed and overstimulated from running too hot. TCM calls this Heart Fire and if you’ve ever moved through a summer of racing thoughts, restless or sweaty sleep, inexplicable irritability, or that buzzy chest-centered anxiety that arrives in the heat you may already know exactly what it feels like.
Heart Fire is one of the most common internal patterns in TCM. It arises from prolonged emotional stress, too much heating + greasy food and stimulants, or fire transmitted from other organs like the Liver. It’s easier to tip into this pattern in summer than in any other season because the fire element is already working on the body from the outside environment.
Bitter foods and herbs are the direct medicine for this. They cool Heart Fire, soothe physical and emotional excitation, and calm the flow of blood.
Many bitter foods also improve insulin sensitivity and help regulate blood glucose, directly protecting against the metabolic complications that put so much pressure on the cardiovascular system. Researchers have even discovered bitter taste receptors called T2Rs which reside directly on human heart tissue and throughout the gastrointestinal tract, suggesting the body is evolutionarily designed to pick up on and receive these important bitter compounds. This is something that TCM has known for thousands of years, but it’s always nice when modern research arrives to support and expand upon this knowledge.
Which makes the near total absence of the bitter flavor in the modern American diet worth paying attention to. National surveys confirm that roughly 50% to 68% of American coffee drinkers regularly customize their beverages with sugar, sweeteners, or flavored creamers, with only 20% to 32% drinking it completely black. Coffee is where most Americans are getting their bitters and most of us are burying them under cream and sugar, muting the very compounds that make them medicinal. This filtered, sweetened relationship with bitterness across the whole of the American diet, across herbs, vegetables, and whole grains, may be contributing to the steady rise in cardiovascular disease.
I’ve noticed that so many Asian, African, and Mediterranean-style diets carry real bitterness in them as a matter of course. Green tea in Japan, bitter melon stir-fries and curries in China and India, bitter leaf or ewuro in Nigerian Yoruba cuisine. Places outside the West seem to understand intuitively what TCM has always known about bitter’s detoxifying and protective properties but not so much America.
Working to restore bitters to the American diet is why this is one of my favorite flavors to work with, both for its challenge and for everything it offers the digestive system and the heart.
These Are My Favorite Bitters
Bitterness clings to the mouth perhaps more than any other flavor. It’s acrid, sharp, with a dry-mouth coating astringency that evokes the taste of earth-bound roots and vegetative leaves.
But it’s also, and I want to make this case clearly, one of the most sophisticated and satisfying flavors we have. The depth in a perfectly pulled espresso, the complexity in good dark chocolate, and the reason a handful of arugula dressed with good olive oil and lemon stops you mid-bite.
The most beloved and craved flavors in the world carry bitterness at their core. What got in the way was a combination of childhood taste trauma, those sad grey Brussels sprouts doing real damage to an entire generation of palates, and a food industry that spent decades engineering bitterness out of everything and burying what remained under layers of salt, sugar, and fat until we forgot it was ever there. Or what it tasted like.
As an herbalist I find bitter foods and herbs to be among my greatest pleasures, both for the challenge and for the surprising deliciousness they’re capable of. These are just some of my favorites.
Cacao (Theobroma cacao)
Called kakaw by the Mayans and cacahuatl by the Aztecs, cacao has been considered sacred medicine in Mesoamerica for thousands of years, used as currency, ritual, and sustenance long before it became one the world’s most beloved flavor likely only seconded by Vanilla. Its botanical name Theobroma means food of the gods, which feels about right the first time you taste pure cacao with nothing added, that deep, complex, almost smoky bitterness that blooms in the mouth and settles into something surprisingly satisfying.
It’s also one of the most powerful cardiovascular herbs we have, rich in flavonoids that support heart function and improve circulation, making it a natural companion to everything the summer heart needs right now.
In summer I reach for cacao differently than I do in winter. I’ll cold brew it overnight, combining raw cacao nibs with cinnamon, a pinch of cayenne, and cold water, then straining it over ice in the morning for something bitter, complex, faintly spicy, and genuinely cooling. Cacao nibs scattered over a smoothie bowl with fresh mango and coconut are another summer favorite. Always look for USDA Organic and fair trade certifications when purchasing. There is real exploitation in the cacao industry and ethical sourcing is one of the most direct ways we can use our dollars to push back against it.
Green Tea (Camellia sinensis)
I am a die-hard green tea lover and summer is when my devotion makes the most sense. Cold-brewed gyokuro or sencha, steeped slowly overnight in cool water, produces a cup that is smooth, deeply vegetal, and bitingly bitter in the best possible way. None of the astringency of hot steeping, just the clean cooling bitterness the summer body is asking for. I love it as a base for herbal blends, paired with chrysanthemum and dried orange peel, or simply on its own over ice with a slice of lemon.
A note on cold brewing: yes, TCM generally cautions against cold drinks for their dampening effect on digestive fire. But in the peak heat of Fire Horse Summer the cooling medicine of green tea outweighs that concern, especially when you’re sipping slowly rather than gulping ice water on an empty stomach. Context matters in TCM as much as anything else.
Green tea is also one of the most well studied cardiovascular herbs we have. Regular consumption is consistently associated with reduced risk of cardiovascular disease and stroke, making it a natural companion to the summer heart work we’ve already been talking about. If you’re only doing one thing differently this Fire Horse Summer, a daily cold-brewed green tea is a very good place to start.
Motherwort (Leonurus cardiaca)
Called Yi Mu Cao (益母草) in TCM, meaning beneficial for mothers, and Leonurus cardiaca in Latin, meaning lion-hearted, Motherwort has been used for centuries to strengthen the heart and ease the particular anxiety that lives in the chest. It is a cardiotonic, a postpartum ally, and in my practice the herb I reach for most readily when the summer heat starts doing its work on the nervous system.
The ideal candidate for Motherwort is who I call the tender worry-hearted. This person is usually highly empathetic, always on edge as a result, with their anxiety localized specifically to the chest. Tightness there, shortness of breath, fluttery persistent heart palpitations, a red-tipped tongue. In summer these feelings have a way of rising with the heat, the racing thoughts arriving with the warm nights, the flushed face, the irritability that feels more physical than emotional. This is Heart Fire and Motherwort is one of its most direct medicines.
It is perhaps the most acrid bitter on this list which is why I most often administer it as a tincture. But my favorite summer preparation is a cold hibiscus motherwort tea. Hibiscus is a famous blood pressure lowering herb and fellow cardiotonic whose deep tartness softens the bitter while doing its own heart protective work alongside it. Brewed strong, sweetened lightly with raw honey, strained over ice. I’ve had many people happily drink two cups without ever registering the Motherwort at all.
This Summer Start With Taste
I’m always having people ask me “Ayame, what do I need to do to really learn herbalism?” They’re usually a little surprised when I tell them to start by learning how to taste their food and medicine. Not a thousand dollar course. Not a stack of books. Not a school.
Because taste is a language and the easiest way to learn it is to engage with it every day as you move with the seasons. Whether you’re studying TCM, Kampo, Ayurveda, or the diverse healing traditions of the African Diaspora you’re going to find a system for categorizing taste and aligning it to herbal action.
Salty isn’t just salty. Sweet isn’t just sweet. And bitter isn’t just bitter for the fun of it. It’s a very real conversation happening between the plant and the body, carried in the alkaloids in your morning coffee, in the pleasant grip of a well-steeped green tea on the back of the palate, in the acrid pull of Motherwort doing its quiet work on an overheated heart.
This Fire Horse Summer the bitters are waiting. Your morning coffee, your salad, a cold hibiscus motherwort tea on a hot afternoon.
Happy Fire Horse Summer.
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References:
Bialik Carl, Taylor Orth, and Oana Dumitru. 2022. “How Do People in the U.S. Take Their Coffee?” Yougov.com. 2022.
Kaptchuk, Ted J. 2000. The Web That Has No Weaver : Understanding Chinese Medicine. Lincolnwood, Ill.: Contemporary Books.
Publishing, Harvard Health. 2012. “Green Tea May Lower Heart Disease Risk.” Harvard Health. December 1, 2012.
Qiao, Kaina, Mingxia Zhao, Yan Huang, Li Liang, and Yuyu Zhang. 2024. “Bitter Perception and Effects of Foods Rich in Bitter Compounds on Human Health: A Comprehensive Review.” Foods 13 (23): 3747.
Zamani, Mohammad, Mahnaz Rezaei Kelishadi, Damoon Ashtary-Larky, Niusha Amirani, Kian Goudarzi, Iman Attackpour Torki, Reza Bagheri, Matin Ghanavati, and Omid Asbaghi. 2023. “The Effects of Green Tea Supplementation on Cardiovascular Risk Factors: A Systematic Review and Meta-Analysis.” Frontiers in Nutrition 9 (January).
