Drinking beverages that are too hot can cause widespread damage to the skin and mucous membranes. Protein begins to denature at 43°C, gastrointestinal mucous undergoes irreversible degradation at 60°C, and blood cells, cultured cells, and transplanted organs all die at temperatures above 47°C. Therefore, do not frequently drink overly hot beverages in the winter. Avoid eating too many oranges
Oranges are a fruit with a relatively high calorie content. Eating too many at once can lead to "internal heat," resulting in symptoms such as a dry mouth, sore throat, and swollen tonsils. Therefore, oranges should not be eaten in excess. Avoid eating un-pickled pickles
Un-pickled pickles contain a large amount of nitrite. When it enters the human bloodstream, it oxidizes normal low-iron hemoglobin into high-iron hemoglobin, causing red blood cells to lose their oxygen-carrying function. This leads to systemic hypoxia, with symptoms such as chest tightness, shortness of breath, fatigue, and listlessness. Furthermore, nitrosamine compounds are carcinogenic. Avoid eating sweet potatoes with black spots
Sweet potatoes with brown or black skin on the surface are contaminated by black spot bacteria. The toxins excreted by this bacteria contain ipomeamarone, which makes the sweet potato hard and bitter and is harmful to the human liver. The biological activity of this toxin cannot be destroyed by boiling, steaming, or roasting. Therefore, eating sweet potatoes with black spots can cause poisoning.