Diet and Depression in Korean Medicine: The Foods That Stagnate Qi

In Korean Traditional Medicine (KTM), the traditional healing system of Korea also known as Hanbang (한방), depression is a disease of stagnant Qi — a state in which the body’s Qi stalls and, with it, the whole of one’s physiology slows. KTM looked beyond troubled thoughts to the things that stagnate Qi in the first place, among them the dysfunction of the internal organs and, notably, food: sweet and greasy foods, once taken in, can themselves stagnate the Qi. So diet was always considered part of the picture. Tellingly, KTM never made the brain the center of mental illness — and modern research is now arriving at much the same body-first view.

In Summary

KTM reads depression as stagnant Qi that lowers all of the body’s functions — and counts sweet, greasy foods among the things that stagnate it.
It located mood in the organs and the body rather than the brain, which is why food and the state of the body were always part of treatment.
Modern nutritional psychiatry is converging on this: diet shapes mood through inflammation, the gut microbiome, the liver, and the supply of what the brain needs to build mood chemicals.
Diets high in sugar and saturated fat drive inflammation and fatty liver, both linked to higher depression risk; anti-inflammatory patterns like the Mediterranean and MIND diets are linked to lower risk.
The practical move overlaps exactly with the old advice: less sugar and saturated fat, more vegetables, legumes, whole grains, fish, and olive oil.

Depression as Stagnant Qi — and the Role of Food

The starting point is the KTM reading of depression itself: not simply a low mood but a stagnation of Qi that drags down every physiological process. Crucially, KTM did not treat this as a matter of thought alone. It paid close attention to whatever could stagnate the Qi from the body’s side — the faltering of the internal organs, and the food coming in. Sweet and greasy foods, in particular, were understood to stagnate the Qi once eaten, which is why what is on the plate was always treated as bearing on mood. This fits the wider picture in which the Liver courses the Qi and frees the emotions: load the system with the kind of food that clogs it, and both Qi and mood stall.

Why the Brain Was Never the Whole Story

One striking feature of the KTM account is that the brain is not at its center. Mind and mood were understood to arise from the organs and the state of the body as a whole, not from an isolated organ of thought. For a long time that looked like a limitation next to a neuroscience focused on brain chemistry. But the modern study of diet and mood has begun to vindicate the body-first instinct: more and more, the brain looks less like the sole author of mood and more like a downstream reader of what the rest of the body is doing.

What Modern Research Adds

Contemporary nutritional psychiatry fills in the mechanism. Diet appears to shape mood along several body-level routes at once. Chronic inflammation can alter brain chemistry and mood. The gut microbiome — reshaped, for better or worse, by how much fiber and how much sugar one eats — sends signals onward to the brain. The liver matters too: a diet heavy in sugar and saturated fat promotes fatty liver, which is strikingly common (on the order of one adult in four) and is associated with a higher risk of depression. And the brain depends on a steady supply of the raw materials from which it builds mood chemicals such as serotonin and dopamine. Anti-inflammatory eating patterns — the Mediterranean and MIND diets, rich in vegetables, legumes, whole grains, fish, and olive oil and light on red meat — are associated with lower depression risk. The cruel catch is that the foods worst for mood over time are often the ones that feel comforting in the moment.

What Helps

The practical conclusion is the same from both directions. Cutting back on sugar and saturated fat eases the burden on the liver and lowers inflammation; leaning toward fiber, vegetables, legumes, whole grains, fish, and olive oil supports a healthier gut and a calmer internal state. This is, almost word for word, the old counsel to avoid the sweet and greasy foods that stagnate the Qi — now with a modern account of why it works. (Diet is a complement to care, not a replacement for it: moderate or severe depression needs professional treatment, medication or psychotherapy or both, and prescribed treatment should not be stopped on one’s own.)

In Summary

KTM read depression as stagnant Qi, named sweet and greasy foods among its causes, and placed mood in the body rather than the brain — and modern nutritional psychiatry, tracing mood through inflammation, the gut, the liver, and the brain’s raw materials, has largely caught up. Eat in the way that keeps the Qi moving and the body uninflamed — less sugar and saturated fat, more vegetables, whole grains, fish, and olive oil — and you support the mind through the body, exactly as both traditions, in the end, advise.

This article reflects the clinical observations and teaching practice of Professor Seungho Baek, Professor of Korean Medicine at Dongguk University College of Korean Medicine, specializing in Pathology and Oncology.