Sweating in Great Heat Does Not Equal Good Metabolism! TCM Doctor Warns Against '4 Bad Habits' and Shares How to Eat for Detoxifying Dampness

In just two days, the traditional hottest period of the year, 'Great Heat' (Dàshǔ), will arrive. Many people assume that hot weather and heavy sweating boost metabolism, but this is a common misconception. TCM physician Zhou Daxiang warns that four common bad habits during summer are often overlooked, which can deplete the body’s vital energy (qi) and fluids, weaken spleen and stomach functions, accumulate dampness, and ultimately reduce metabolic efficiency—leading to fatigue, swelling, poor appetite, digestive discomfort, and even weight gain.

Zhou Daxiang explains that true metabolism is not merely about burning calories, but rather the body’s ability to convert food into energy, eliminate metabolic waste, maintain smooth circulation of qi and blood, and ensure proper organ function. When metabolism is imbalanced, people not only feel tired but also experience weakened immunity and overall health decline.

According to Zhou, the four summer habits that most easily impair metabolism are:

1. Replacing meals with icy drinks, bubble teas, or fruits due to poor appetite. While this may feel refreshing temporarily, it leads to nutritional imbalance. High-sugar diets also cause rapid blood sugar fluctuations, promoting fat accumulation and lowering metabolic efficiency.

2. Setting air conditioning too low. Prolonged exposure to cold indoor environments reduces blood circulation, decreases muscle activity, and lowers overall calorie expenditure.

3. Staying up late to watch events like the World Cup. Sleep deprivation disrupts hormonal balance, weakens the body’s recovery ability, causes poor focus and increased appetite the next day, and leads to overconsumption of high-calorie foods.

4. Avoiding exercise due to heat. Reduced physical activity and muscle loss gradually lower basal metabolic rate.

Zhou emphasizes that in Traditional Chinese Medicine (TCM), the spleen governs transformation and transportation—responsible for converting nutrients from food into qi and blood, and distributing fluids throughout the body. When spleen function weakens, dampness accumulates internally. People with excessive dampness often experience heavy limbs, fatigue, brain fog, poor appetite, sticky bowel movements, and swelling. Even without overeating, they feel sluggish and mentally drained.

Therefore,养生 (yangsheng) during Great Heat should not only focus on cooling down but also on strengthening the spleen, removing dampness, and replenishing qi and blood to restore normal metabolic function.

Zhou recommends four key principles to boost metabolism during Great Heat:

1. Avoid icy drinks, drink warm water. After heavy sweating, hydration is essential—but opt for room-temperature or warm water. Drinking large amounts of ice-cold water at once can impair spleen and stomach function.

2. Eat light yet balanced meals. Increase intake of seasonal vegetables, high-quality proteins, and whole grains. Reduce fried foods, desserts, and sugary beverages to maintain stable metabolism.

3. Exercise regularly. Engage in moderate-intensity activities like brisk walking, swimming, cycling, or yoga during cooler hours (early morning or evening), for at least 150 minutes per week. This boosts basal metabolic rate and improves cardiovascular health.

4. Prioritize sleep over supplements. Aim for 7–8 hours of sleep daily and try to sleep before 11 PM to support bodily repair and hormonal balance, maintaining healthy metabolic function.