Mung Bean Soup Is Going Viral as a Summer Cooling Hack — Here Is the Actual TCM Story
Mung bean soup has been a Chinese summer staple for 2,000 years. Here is why it works, what most Western recipes get wrong, and the correct preparation.
What Happened
Every summer, a version of the same Xiaohongshu post goes viral: someone shares their grandmother's mung bean soup recipe (绿豆汤) with the caption "the only thing that actually works in a heatwave." The comments fill with people sharing their own family versions, their preferred sweetener (rock sugar vs honey vs none), and arguments about whether to crack the beans open or keep them whole.
In 2024-25, this annual tradition crossed into Western feeds through chinamaxxing content, and mung bean soup started appearing on English-language wellness accounts as a "Chinese cooling hack."
Example via Serious Eats coverage of Chinese cooling foods
Why It Actually Works
Mung bean soup is not a hack. It has been a Chinese summer staple for roughly two thousand years and appears in classical Chinese medical texts as a primary treatment for 暑热 (shǔ rè) — summer heat accumulation.
In TCM, mung beans are classified as cold in thermal nature and specifically enter the heart and stomach meridians. They clear heat, generate fluids, and detoxify. During a heatwave, when internal heat accumulates and the body's cooling mechanisms are overwhelmed, mung bean soup addresses the pattern directly.
The preparation matters: the liquid is the medicine. You do not need to eat the beans themselves to get the therapeutic benefit — the cooking water, which turns a characteristic yellow-green as the beans break open, is what you drink. The beans are optional.
Western nutrition science finds different but compatible mechanisms: mung beans are rich in polyphenols with documented antioxidant and anti-inflammatory effects, and the high water content supports hydration in heat.
What Most Western Recipes Get Wrong
Most Western adaptations of mung bean soup add coconut milk, make it thick like a dessert, and serve it cold from the refrigerator.
The Chinese version is simpler, thinner, and served warm or at room temperature — not cold. Serving it cold would add unnecessary thermal cooling on top of an already-cold food, potentially suppressing digestive function. The goal is to clear internal heat, not to shock the system.
The recipe: 100g mung beans, 1 litre water, simmer 30-40 minutes until the beans just begin to split. Add a small piece of rock sugar. Drink the liquid warm or at room temperature.
That is it. No coconut milk. No toppings. Just the original.
For the full TCM context: Mung Bean Benefits in Chinese Medicine.