Why? Some people are afraid of the cold, while others are not. Explain the reasons for praise.

1, which is mainly due to the decrease of thyroid hormone level and insufficient iron content in human blood. Thyroxine can produce heat, which can accelerate the oxidation process of tissues and cells in human body and increase heat; Thyroxine can also improve the basal metabolic rate of human body and accelerate the blood circulation of skin, thus generating body heat to resist the cold. If the body lacks iodine for a long time, the raw materials for synthesizing thyroxine will be insufficient, and the body's ability to keep out the cold will also be reduced. Iron is an important raw material for producing hemoglobin, which is responsible for the transport and metabolism of oxygen in the body. If there is iron deficiency in the diet, it is easy to suffer from iron deficiency anemia, so that nutrients can not be fully oxidized, and it is easy to feel cold if the calories are not enough. 2

Some people with thick blood vessels and fast blood flow are not afraid of cold. On the contrary, if the blood vessels are too thin and the blood does not flow to the extremities, they will be more afraid of the cold, which is more common in thin girls. 3, kidney deficiency: people with kidney deficiency have the phenomenon of parasympathetic hyperfunction, which leads to slower heartbeat, lower blood pressure and lower basal body temperature, so they are afraid of cold. 4. Iron deficiency: It is found that people with low cold tolerance have insufficient iron content in blood, which is often accompanied by a decrease in plasma thyroxine level. The main reason of iron deficiency in women is the loss of iron during physiological period. 5, the abdomen is cold: cold leads to poor blood circulation, and it is easy to cause diarrhea and constipation, which makes people feel cold. 6, edema: excess water oozing from blood vessels, backlog around blood vessels affecting blood flow. 7. Headache: Headache is sometimes caused by poor blood and lymphatic circulation caused by stiff cervical spine or shoulders.