Does longan fruit (Nephelium lappaceum) help reduce internal heat?
Jun 30, 2025
Source: Cainiu Health
Dr. Sun Lianqing
Introduction
Longan does not have the effect of reducing internal heat. Longan is considered warm in nature, and its consumption may increase internal body heat. In traditional Chinese medicine theory, foods with warm properties cannot achieve the effects of clearing heat or reducing fire. For individuals experiencing symptoms of excessive internal heat, such as sore throat or gum bleeding, consuming longan will not alleviate these symptoms and may instead exacerbate internal heat and dryness.
Under normal circumstances, rambutan does not have the effect of reducing internal heat ("fire"). From both its properties and nutritional components, excessive consumption may even exacerbate internal heat. Detailed analysis is as follows:
Rambutan has a warm nature and may increase internal warmth after consumption. According to traditional Chinese medicine theory, warm-natured foods cannot achieve the effects of clearing heat or removing fire. For individuals already experiencing symptoms of internal heat, such as sore throat or gum bleeding, consuming rambutan will not alleviate these symptoms but rather worsen internal dry heat.
Rambutan contains relatively high sugar content. Excessive sugar intake consumes large amounts of B vitamins during metabolism in the human body. When vitamin levels are insufficient, the body may develop heat-related symptoms like mouth ulcers. Additionally, excessive sugar can be converted into heat energy and accumulate in the body, further intensifying internal "fire."
Consumption of rambutan should be moderated to avoid eating large quantities at once. If experiencing symptoms of internal heat or having a naturally hot body constitution, one should be particularly cautious when consuming rambutan. It is advisable to choose cool-natured fruits to regulate body condition and maintain a balanced diet.
